285 lines
17 KiB
JSON
285 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-66883",
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"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"state": "PUBLISHED",
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"assignerShortName": "EEF",
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"dateReserved": "2026-07-28T04:15:10.240Z",
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"datePublished": "2026-08-04T11:46:05.191Z",
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"dateUpdated": "2026-08-04T12:27:58.024Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"collectionURL": "https://repo.hex.pm",
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"cpes": [
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"cpe:2.3:a:erlef:oidcc_plug:*:*:*:*:*:erlang:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"Elixir.Oidcc.Plug.Authorize",
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"Elixir.Oidcc.Plug.AuthorizationCallback"
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],
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"packageName": "oidcc_plug",
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"packageURL": "pkg:hex/oidcc_plug",
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"product": "oidcc_plug",
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"programFiles": [
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"lib/oidcc/plug/authorize.ex",
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"lib/oidcc/plug/authorization_callback.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Oidcc.Plug.Authorize':call/2"
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},
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{
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"name": "'Elixir.Oidcc.Plug.AuthorizationCallback':call/2"
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}
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],
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"repo": "https://github.com/erlef/oidcc_plug",
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"vendor": "Erlang Ecosystem Foundation",
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"versions": [
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{
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"lessThan": "0.5.0",
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"status": "affected",
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"version": "0.1.0-alpha.3",
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"versionType": "semver"
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}
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]
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},
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{
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"collectionURL": "https://github.com",
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"cpes": [
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"cpe:2.3:a:erlef:oidcc_plug:*:*:*:*:*:erlang:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"Elixir.Oidcc.Plug.Authorize",
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"Elixir.Oidcc.Plug.AuthorizationCallback"
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],
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"packageName": "erlef/oidcc_plug",
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"packageURL": "pkg:github/erlef/oidcc_plug",
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"product": "oidcc_plug",
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"programFiles": [
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"lib/oidcc/plug/authorize.ex",
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"lib/oidcc/plug/authorization_callback.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Oidcc.Plug.Authorize':call/2"
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},
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{
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"name": "'Elixir.Oidcc.Plug.AuthorizationCallback':call/2"
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}
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],
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"repo": "https://github.com/erlef/oidcc_plug",
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"vendor": "Erlang Ecosystem Foundation",
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"versions": [
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{
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"lessThan": "f15e52c5750aaba701104b10ed96cfac063bd557",
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"status": "affected",
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"version": "0a75fb139d8e2686d1b75e0d48962323d2181673",
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"versionType": "git"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"cpeMatch": [
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{
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"criteria": "cpe:2.3:a:erlef:oidcc_plug:*:*:*:*:*:erlang:*:*",
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"versionEndExcluding": "0.5.0",
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"versionStartIncluding": "0.1.0-alpha.3",
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"vulnerable": true
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}
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],
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"negate": false,
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"operator": "OR"
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}
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],
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"operator": "AND"
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "Mathias Polligkeit"
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},
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{
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"lang": "en",
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"type": "remediation developer",
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"value": "Jonatan Männchen / EEF"
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},
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{
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"lang": "en",
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"type": "remediation reviewer",
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"value": "Mathias Polligkeit"
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},
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{
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"lang": "en",
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"type": "coordinator",
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"value": "Jonatan Männchen / EEF"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Improper Handling of Case Sensitivity vulnerability in Erlang Ecosystem Foundation oidcc_plug (<code>Oidcc.Plug.Authorize</code> module) renders the user agent session binding inert, removing a defense in depth control against replay of a stolen session.</p>\n<p>This vulnerability is associated with program files <code>lib/oidcc/plug/authorize.ex</code> and <code>lib/oidcc/plug/authorization_callback.ex</code>, and program routines <code>Oidcc.Plug.Authorize.call/2</code> and <code>Oidcc.Plug.AuthorizationCallback.call/2</code>.</p>\n<p><code>Oidcc.Plug.Authorize.call/2</code> reads the initiating client's user agent with <code>get_req_header(conn, \"User-Agent\")</code>. Plug lowercases incoming header names, but <code>get_req_header/2</code> matches the supplied key exactly and performs no normalization of its own, so the mixed-case lookup always returns an empty list and <code>nil</code> is written into the session. On the callback side, <code>Oidcc.Plug.AuthorizationCallback</code> treats a stored <code>nil</code> user agent as nothing to compare and returns <code>:ok</code> without inspecting the request. The two behaviours combine so that the check passes unconditionally on every request, including for deployments that explicitly opted in with <code>check_useragent: true</code>, and an authorization callback can be completed from a different user agent than the one that initiated the flow without detection. The check fails open silently, with no error and no log entry, so a deployment cannot tell the binding is absent.</p>\n<p>The impact is limited to defense in depth. The inert check does not by itself allow an attacker to complete an authorization flow; it removes one layer that would otherwise hinder use of a stolen or leaked session, such as an exfiltrated session cookie replayed from a different client. The CSRF/state, nonce, and PKCE checks are unaffected and continue to function. Deployments that never enabled <code>check_useragent</code> are not affected in practice, since they never expected the binding. The corresponding lookup in <code>Oidcc.Plug.AuthorizationCallback</code> correctly uses the lowercase key and is not affected.</p>\n<p>This issue affects oidcc_plug: from 0.1.0-alpha.3 before 0.5.0.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "Improper Handling of Case Sensitivity vulnerability in Erlang Ecosystem Foundation oidcc_plug (`Oidcc.Plug.Authorize` module) renders the user agent session binding inert, removing a defense in depth control against replay of a stolen session.\n\nThis vulnerability is associated with program files `lib/oidcc/plug/authorize.ex` and `lib/oidcc/plug/authorization_callback.ex`, and program routines `Oidcc.Plug.Authorize.call/2` and `Oidcc.Plug.AuthorizationCallback.call/2`.\n\n`Oidcc.Plug.Authorize.call/2` reads the initiating client's user agent with `get_req_header(conn, \"User-Agent\")`. Plug lowercases incoming header names, but `get_req_header/2` matches the supplied key exactly and performs no normalization of its own, so the mixed-case lookup always returns an empty list and `nil` is written into the session. On the callback side, `Oidcc.Plug.AuthorizationCallback` treats a stored `nil` user agent as nothing to compare and returns `:ok` without inspecting the request. The two behaviours combine so that the check passes unconditionally on every request, including for deployments that explicitly opted in with `check_useragent: true`, and an authorization callback can be completed from a different user agent than the one that initiated the flow without detection. The check fails open silently, with no error and no log entry, so a deployment cannot tell the binding is absent.\n\nThe impact is limited to defense in depth. The inert check does not by itself allow an attacker to complete an authorization flow; it removes one layer that would otherwise hinder use of a stolen or leaked session, such as an exfiltrated session cookie replayed from a different client. The CSRF/state, nonce, and PKCE checks are unaffected and continue to function. Deployments that never enabled `check_useragent` are not affected in practice, since they never expected the binding. The corresponding lookup in `Oidcc.Plug.AuthorizationCallback` correctly uses the lowercase key and is not affected.\n\nThis issue affects oidcc_plug: from 0.1.0-alpha.3 before 0.5.0."
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}
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],
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"value": "Improper Handling of Case Sensitivity vulnerability in Erlang Ecosystem Foundation oidcc_plug (Oidcc.Plug.Authorize module) renders the user agent session binding inert, removing a defense in depth control against replay of a stolen session.\n\nThis vulnerability is associated with program files lib/oidcc/plug/authorize.ex and lib/oidcc/plug/authorization_callback.ex, and program routines Oidcc.Plug.Authorize.call/2 and Oidcc.Plug.AuthorizationCallback.call/2.\n\nOidcc.Plug.Authorize.call/2 reads the initiating client's user agent with get_req_header(conn, \"User-Agent\"). Plug lowercases incoming header names, but get_req_header/2 matches the supplied key exactly and performs no normalization of its own, so the mixed-case lookup always returns an empty list and nil is written into the session. On the callback side, Oidcc.Plug.AuthorizationCallback treats a stored nil user agent as nothing to compare and returns :ok without inspecting the request. The two behaviours combine so that the check passes unconditionally on every request, including for deployments that explicitly opted in with check_useragent: true, and an authorization callback can be completed from a different user agent than the one that initiated the flow without detection. The check fails open silently, with no error and no log entry, so a deployment cannot tell the binding is absent.\n\nThe impact is limited to defense in depth. The inert check does not by itself allow an attacker to complete an authorization flow; it removes one layer that would otherwise hinder use of a stolen or leaked session, such as an exfiltrated session cookie replayed from a different client. The CSRF/state, nonce, and PKCE checks are unaffected and continue to function. Deployments that never enabled check_useragent are not affected in practice, since they never expected the binding. The corresponding lookup in Oidcc.Plug.AuthorizationCallback correctly uses the lowercase key and is not affected.\n\nThis issue affects oidcc_plug: from 0.1.0-alpha.3 before 0.5.0."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-60",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-60 Reusing Session IDs (aka Session Replay)"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV4_0": {
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"attackComplexity": "HIGH",
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"attackRequirements": "PRESENT",
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"attackVector": "NETWORK",
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"baseScore": 6.3,
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"baseSeverity": "MEDIUM",
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"privilegesRequired": "NONE",
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"providerUrgency": "NOT_DEFINED",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"userInteraction": "NONE",
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"valueDensity": "NOT_DEFINED",
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"vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "NONE",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "LOW",
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"vulnerabilityResponseEffort": "NOT_DEFINED"
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-178",
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"description": "CWE-178 Improper Handling of Case Sensitivity",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"shortName": "EEF",
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"dateUpdated": "2026-08-04T11:46:05.191Z"
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},
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"references": [
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{
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"tags": [
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"vendor-advisory",
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"related"
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],
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"url": "https://github.com/erlef/oidcc_plug/security/advisories/GHSA-w5r8-m75h-98fc"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://cna.erlef.org/cves/CVE-2026-66883.html"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://osv.dev/vulnerability/EEF-CVE-2026-66883"
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},
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{
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"tags": [
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"patch"
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],
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"url": "https://github.com/erlef/oidcc_plug/commit/f15e52c5750aaba701104b10ed96cfac063bd557"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"title": "Oidcc.Plug.Authorize user agent session binding inert due to case-sensitive header lookup"
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/erlef/oidcc_plug/security/advisories/GHSA-w5r8-m75h-98fc",
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"tags": [
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"exploit"
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]
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}
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],
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-08-04T12:27:16.535019Z",
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"id": "CVE-2026-66883",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-08-04T12:27:58.024Z"
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}
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}
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]
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}
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} |