280 lines
13 KiB
JSON
280 lines
13 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-2026-53424",
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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": "2026-06-09T11:01:47.529Z",
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"datePublished": "2026-08-20T17:27:11.115Z",
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"dateUpdated": "2026-08-21T19:42:21.623Z"
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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:dropbox:samly:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Samly.Helper'"
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],
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"packageName": "samly",
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"packageURL": "pkg:hex/samly",
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"product": "samly",
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"programFiles": [
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"lib/samly/helper.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Samly.Helper':decode_idp_auth_resp/3"
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}
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],
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"repo": "https://github.com/dropbox/samly",
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"vendor": "dropbox",
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"versions": [
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{
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"lessThan": "*",
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"status": "affected",
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"version": "0.3.0",
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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:dropbox:samly:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Samly.Helper'"
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],
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"packageName": "dropbox/samly",
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"packageURL": "pkg:github/dropbox/samly",
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"product": "samly",
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"programFiles": [
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"lib/samly/helper.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Samly.Helper':decode_idp_auth_resp/3"
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}
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],
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"repo": "https://github.com/dropbox/samly",
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"vendor": "dropbox",
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"versions": [
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{
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"lessThan": "*",
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"status": "affected",
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"version": "8a5bb1b4a4753d05470da2036323477f63cfdf4c",
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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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"collectionURL": "https://github.com",
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"cpes": [
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"cpe:2.3:a:handnot2:samly:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Samly.Helper'"
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],
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"packageName": "handnot2/samly",
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"packageURL": "pkg:github/handnot2/samly",
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"product": "samly",
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"programFiles": [
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"lib/samly/helper.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Samly.Helper':decode_idp_auth_resp/3"
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}
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],
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"repo": "https://github.com/handnot2/samly",
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"vendor": "handnot2",
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"versions": [
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{
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"lessThan": "*",
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"status": "affected",
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"version": "8a5bb1b4a4753d05470da2036323477f63cfdf4c",
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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:dropbox:samly:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "0.3.0",
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"vulnerable": true
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},
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{
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"criteria": "cpe:2.3:a:handnot2:samly:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "0.3.0",
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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": "reporter",
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"value": "Mark Madsen"
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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>Authentication Bypass by Capture-replay vulnerability in dropbox samly allows an attacker to authenticate as the subject of a captured SAML assertion by resubmitting it.</p>\n<p><code>Samly.Helper.decode_idp_auth_resp/3</code> in <code>lib/samly/helper.ex</code> calls <code>esaml_sp:validate_assertion/2</code>, whose default duplicate detector is a no-op. The <code>/3</code> arity accepting a <code>DuplicateFun</code> exists in <code>esaml</code> and implements the check, but Samly never calls it and offers no configuration to supply one, so the SAML 2.0 Web Browser SSO Profile requirement that a bearer assertion be used once is unenforced. An attacker holding a valid <code>SAMLResponse</code> obtained from the network, from browser history, or from logs can submit the identical bytes repeatedly until the assertion's <code>NotOnOrAfter</code> passes, each time establishing a session as the assertion's subject.</p>\n<p>This issue affects samly: from 0.3.0 onward.</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": "Authentication Bypass by Capture-replay vulnerability in dropbox samly allows an attacker to authenticate as the subject of a captured SAML assertion by resubmitting it.\n\n`Samly.Helper.decode_idp_auth_resp/3` in `lib/samly/helper.ex` calls `esaml_sp:validate_assertion/2`, whose default duplicate detector is a no-op. The `/3` arity accepting a `DuplicateFun` exists in `esaml` and implements the check, but Samly never calls it and offers no configuration to supply one, so the SAML 2.0 Web Browser SSO Profile requirement that a bearer assertion be used once is unenforced. An attacker holding a valid `SAMLResponse` obtained from the network, from browser history, or from logs can submit the identical bytes repeatedly until the assertion's `NotOnOrAfter` passes, each time establishing a session as the assertion's subject.\n\nThis issue affects samly: from 0.3.0 onward."
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}
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],
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"value": "Authentication Bypass by Capture-replay vulnerability in dropbox samly allows an attacker to authenticate as the subject of a captured SAML assertion by resubmitting it.\n\nSamly.Helper.decode_idp_auth_resp/3 in lib/samly/helper.ex calls esaml_sp:validate_assertion/2, whose default duplicate detector is a no-op. The /3 arity accepting a DuplicateFun exists in esaml and implements the check, but Samly never calls it and offers no configuration to supply one, so the SAML 2.0 Web Browser SSO Profile requirement that a bearer assertion be used once is unenforced. An attacker holding a valid SAMLResponse obtained from the network, from browser history, or from logs can submit the identical bytes repeatedly until the assertion's NotOnOrAfter passes, each time establishing a session as the assertion's subject.\n\nThis issue affects samly: from 0.3.0 onward."
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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": "LOW",
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"attackRequirements": "PRESENT",
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"attackVector": "NETWORK",
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"baseScore": 9.1,
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"baseSeverity": "CRITICAL",
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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:L/AT:P/PR:N/UI:N/VC:H/VI:H/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": "HIGH",
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"vulnIntegrityImpact": "HIGH",
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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-294",
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"description": "CWE-294 Authentication Bypass by Capture-replay",
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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": "2026-08-20T18:37:24.439Z"
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},
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"references": [
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{
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"tags": [
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"related",
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"third-party-advisory"
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],
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"url": "https://cna.erlef.org/cves/CVE-2026-53424.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-2026-53424"
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}
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],
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"source": {
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"discovery": "UNKNOWN"
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},
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"title": "Missing one-time-use enforcement in Samly allows replay of SAML bearer assertions"
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},
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"adp": [
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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": "2026-08-21T19:41:30.269903Z",
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"id": "CVE-2026-53424",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "total"
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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": "2026-08-21T19:42:21.623Z"
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}
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}
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]
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}
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} |