205 lines
11 KiB
JSON
205 lines
11 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-2026-78551",
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"assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
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"state": "PUBLISHED",
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"assignerShortName": "CIRCL",
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"dateReserved": "2026-08-24T19:19:59.060Z",
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"datePublished": "2026-08-24T19:20:03.145Z",
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"dateUpdated": "2026-08-24T20:07:41.242Z"
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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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"defaultStatus": "unaffected",
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"product": "ransomlook",
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"vendor": "ransomlook",
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"versions": [
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{
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"lessThanOrEqual": "2.0.0",
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"status": "affected",
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"version": "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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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "Jeroen Pinoy"
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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": "Fafner [_KeyZee_]"
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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>RansomLook contains multiple weaknesses in its authentication endpoint that allow an unauthenticated remote attacker to enumerate valid usernames, perform unrestricted password-guessing attacks, and potentially exhaust application worker resources.</p><p>For local authentication, the login implementation previously checked whether a submitted username existed before invoking the password hash verification function. Requests containing a nonexistent username therefore returned significantly faster than requests for valid accounts, for which the computationally expensive password verification routine was executed. A remote attacker could measure these response-time differences to determine which usernames correspond to valid RansomLook accounts.</p><p>In addition, the <code>/login</code> endpoint did not restrict the number or frequency of failed authentication attempts. An attacker could consequently perform password brute-force, dictionary, password-spraying, or credential-stuffing attacks against known accounts without server-side throttling. For valid usernames, each authentication attempt also invokes the password key-derivation function, which consumes a significant amount of CPU time. A sufficiently high rate of login attempts could therefore occupy the application's synchronous Gunicorn workers and cause a denial of service affecting the entire application.</p><p>The issue has been addressed by always performing password verification using a randomly generated dummy password hash when the supplied username does not exist, eliminating the username-dependent timing discrepancy. Failed authentication attempts are additionally rate-limited per client IP address using Valkey/Redis, with five failed attempts within five minutes resulting in a one-hour block. The reverse-proxy configuration was also updated so that the application derives the client address from a trusted <code>X-Forwarded-For</code> value that cannot be overridden by a client-supplied header.</p><br>"
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}
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],
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"value": "RansomLook contains multiple weaknesses in its authentication endpoint that allow an unauthenticated remote attacker to enumerate valid usernames, perform unrestricted password-guessing attacks, and potentially exhaust application worker resources.\n\nFor local authentication, the login implementation previously checked whether a submitted username existed before invoking the password hash verification function. Requests containing a nonexistent username therefore returned significantly faster than requests for valid accounts, for which the computationally expensive password verification routine was executed. A remote attacker could measure these response-time differences to determine which usernames correspond to valid RansomLook accounts.\n\nIn addition, the /login endpoint did not restrict the number or frequency of failed authentication attempts. An attacker could consequently perform password brute-force, dictionary, password-spraying, or credential-stuffing attacks against known accounts without server-side throttling. For valid usernames, each authentication attempt also invokes the password key-derivation function, which consumes a significant amount of CPU time. A sufficiently high rate of login attempts could therefore occupy the application's synchronous Gunicorn workers and cause a denial of service affecting the entire application.\n\nThe issue has been addressed by always performing password verification using a randomly generated dummy password hash when the supplied username does not exist, eliminating the username-dependent timing discrepancy. Failed authentication attempts are additionally rate-limited per client IP address using Valkey/Redis, with five failed attempts within five minutes resulting in a one-hour block. The reverse-proxy configuration was also updated so that the application derives the client address from a trusted X-Forwarded-For value that cannot be overridden by a client-supplied header."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-49",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-49 Password Brute Forcing"
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}
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]
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},
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{
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"capecId": "CAPEC-16",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-16 Dictionary-based Password Attack"
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}
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]
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},
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{
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"capecId": "CAPEC-565",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-565 Password Spraying"
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}
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]
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},
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{
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"capecId": "CAPEC-600",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-600 Credential Stuffing"
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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": "NONE",
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"attackVector": "NETWORK",
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"baseScore": 8.8,
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"baseSeverity": "HIGH",
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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:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "HIGH",
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"vulnConfidentialityImpact": "LOW",
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"vulnIntegrityImpact": "NONE",
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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-307",
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"description": "CWE-307 Improper Restriction of Excessive Authentication Attempts",
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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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"descriptions": [
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{
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"cweId": "CWE-400",
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"description": "CWE-400 Uncontrolled Resource Consumption",
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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": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
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"shortName": "CIRCL",
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"dateUpdated": "2026-08-24T19:20:03.145Z"
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},
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"references": [
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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/RansomLook/RansomLook/commit/8602740347b0e928ad9fbaf5bc6ff242337dec6b"
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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": "RansomLook Login Endpoint Allows Timing-Based Username Enumeration and Unthrottled Authentication Attempts",
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"x_generator": {
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"engine": "Vulnogram 0.2.0"
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}
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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": "2026-08-24T20:07:33.863606Z",
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"id": "CVE-2026-78551",
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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": "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": "2026-08-24T20:07:41.242Z"
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}
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}
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]
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}
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} |