{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55735", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-06-17T10:44:34.365Z", "datePublished": "2026-08-01T18:46:05.234Z", "dateUpdated": "2026-08-03T19:30:07.608Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:ueberauth:guardian:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Guardian'"], "packageName": "guardian", "packageURL": "pkg:hex/guardian", "product": "guardian", "programFiles": ["lib/guardian.ex"], "programRoutines": [{"name": "'Elixir.Guardian':revoke/3"}], "repo": "https://github.com/ueberauth/guardian", "vendor": "ueberauth", "versions": [{"lessThan": "2.4.1", "status": "affected", "version": "1.0.0", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:ueberauth:guardian:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Guardian'"], "packageName": "ueberauth/guardian", "packageURL": "pkg:github/ueberauth/guardian", "product": "guardian", "programFiles": ["lib/guardian.ex"], "programRoutines": [{"name": "'Elixir.Guardian':revoke/3"}], "repo": "https://github.com/ueberauth/guardian", "vendor": "ueberauth", "versions": [{"lessThan": "2bd7a8c29770d423d855c0a4965caa6c3e486901", "status": "affected", "version": "d65227145f72b290106c06cecbe42728fbf05fe2", "versionType": "git"}]}], "configurations": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>The application must route a caller-supplied token into <tt>Guardian.revoke/3</tt> (for example a logout or session-revocation endpoint) and use a token module whose <tt>revoke</tt> / <tt>on_revoke</tt> callback mutates state keyed by the token claims (a whitelist that deletes by <tt>jti</tt> or a blacklist that inserts by <tt>jti</tt>, such as a GuardianDb-style store). With the default no-op <tt>on_revoke</tt> callback, no session state is changed and the issue is not exploitable.</p>"}], "value": "The application must route a caller-supplied token into Guardian.revoke/3 (for example a logout or session-revocation endpoint) and use a token module whose revoke / on_revoke callback mutates state keyed by the token claims (a whitelist that deletes by jti or a blacklist that inserts by jti, such as a GuardianDb-style store). With the default no-op on_revoke callback, no session state is changed and the issue is not exploitable."}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:ueberauth:guardian:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.4.1", "versionStartIncluding": "1.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Peter Ullrich"}, {"lang": "en", "type": "remediation developer", "value": "Yordis Prieto"}, {"lang": "en", "type": "analyst", "value": "Jonatan M\u00e4nnchen / EEF"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Improper Verification of Cryptographic Signature in ueberauth guardian allows an unauthenticated attacker to revoke a victim's session with a forged token.</p><p><tt>Guardian.revoke/3</tt> in <tt>lib/guardian.ex</tt> decodes the supplied token with <tt>peek/1</tt>, which performs no signature verification (it only base64-decodes the JWT header and payload). The resulting unverified claims are forwarded directly to the configured token module's <tt>revoke</tt> callback and the implementation's <tt>on_revoke</tt> callback, a state-mutating sink. The sibling operations <tt>refresh/2</tt> and <tt>exchange/4</tt> both call <tt>decode_and_verify</tt> first, so the signature is checked before anything acts on the claims; <tt>revoke/3</tt> is the only state-mutating path that acts on claims without verifying the signature.</p><p>An attacker who knows or guesses a victim's identifying claim values (<tt>jti</tt>, <tt>sub</tt>) can forge a JWT carrying those claims, sign it with an arbitrary key, and submit it to any endpoint that funnels a caller-supplied token into <tt>Guardian.revoke/3</tt> (the standard logout / session-revocation pattern). When the token module mutates state keyed by the claims (whitelist deletion or blacklist insertion, for example a GuardianDb-style store), the victim's legitimate session is evicted. 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Reject tokens with an invalid signature at the application boundary.</p>"}], "value": "Verify the token before revoking it: call decode_and_verify (or a verify-without-expiry variant, so already-expired tokens remain revocable) on the caller-supplied token and pass only tokens whose signature validates into Guardian.revoke/3. Reject tokens with an invalid signature at the application boundary."}], "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"references": [{"url": "https://github.com/ueberauth/guardian/security/advisories/GHSA-7975-hp3r-5qhv", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-03T19:29:43.841542Z", "id": "CVE-2026-55735", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-03T19:30:07.608Z"}}]}}

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Reject tokens with an invalid signature at the application boundary.", "supportingMedia": [{"type": "text/html", "value": "<p>Verify the token before revoking it: call <tt>decode_and_verify</tt> (or a verify-without-expiry variant, so already-expired tokens remain revocable) on the caller-supplied token and pass only tokens whose signature validates into <tt>Guardian.revoke/3</tt>. Reject tokens with an invalid signature at the application boundary.</p>", "base64": false}]}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "Improper Verification of Cryptographic Signature in ueberauth guardian allows an unauthenticated attacker to revoke a victim's session with a forged token.\n\nGuardian.revoke/3 in lib/guardian.ex decodes the supplied token with peek/1, which performs no signature verification (it only base64-decodes the JWT header and payload). The resulting unverified claims are forwarded directly to the configured token module's revoke callback and the implementation's on_revoke callback, a state-mutating sink. The sibling operations refresh/2 and exchange/4 both call decode_and_verify first, so the signature is checked before anything acts on the claims; revoke/3 is the only state-mutating path that acts on claims without verifying the signature.\n\nAn attacker who knows or guesses a victim's identifying claim values (jti, sub) can forge a JWT carrying those claims, sign it with an arbitrary key, and submit it to any endpoint that funnels a caller-supplied token into Guardian.revoke/3 (the standard logout / session-revocation pattern). When the token module mutates state keyed by the claims (whitelist deletion or blacklist insertion, for example a GuardianDb-style store), the victim's legitimate session is evicted. This is an unauthenticated session-revocation denial of service; the attacker never needs the signing secret.\n\nThis issue affects guardian: from 1.0.0 before 2.4.1.", "supportingMedia": [{"type": "text/html", "value": "<p>Improper Verification of Cryptographic Signature in ueberauth guardian allows an unauthenticated attacker to revoke a victim's session with a forged token.</p><p><tt>Guardian.revoke/3</tt> in <tt>lib/guardian.ex</tt> decodes the supplied token with <tt>peek/1</tt>, which performs no signature verification (it only base64-decodes the JWT header and payload). The resulting unverified claims are forwarded directly to the configured token module's <tt>revoke</tt> callback and the implementation's <tt>on_revoke</tt> callback, a state-mutating sink. The sibling operations <tt>refresh/2</tt> and <tt>exchange/4</tt> both call <tt>decode_and_verify</tt> first, so the signature is checked before anything acts on the claims; <tt>revoke/3</tt> is the only state-mutating path that acts on claims without verifying the signature.</p><p>An attacker who knows or guesses a victim's identifying claim values (<tt>jti</tt>, <tt>sub</tt>) can forge a JWT carrying those claims, sign it with an arbitrary key, and submit it to any endpoint that funnels a caller-supplied token into <tt>Guardian.revoke/3</tt> (the standard logout / session-revocation pattern). When the token module mutates state keyed by the claims (whitelist deletion or blacklist insertion, for example a GuardianDb-style store), the victim's legitimate session is evicted. This is an unauthenticated session-revocation denial of service; the attacker never needs the signing secret.</p><p>This issue affects guardian: from 1.0.0 before 2.4.1.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-347", "description": "CWE-347 Improper Verification of Cryptographic Signature"}]}], "configurations": [{"lang": "en", "value": "The application must route a caller-supplied token into Guardian.revoke/3 (for example a logout or session-revocation endpoint) and use a token module whose revoke / on_revoke callback mutates state keyed by the token claims (a whitelist that deletes by jti or a blacklist that inserts by jti, such as a GuardianDb-style store). With the default no-op on_revoke callback, no session state is changed and the issue is not exploitable.", "supportingMedia": [{"type": "text/html", "value": "<p>The application must route a caller-supplied token into <tt>Guardian.revoke/3</tt> (for example a logout or session-revocation endpoint) and use a token module whose <tt>revoke</tt> / <tt>on_revoke</tt> callback mutates state keyed by the token claims (a whitelist that deletes by <tt>jti</tt> or a blacklist that inserts by <tt>jti</tt>, such as a GuardianDb-style store). 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{"affected": [{"affectedData": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:ueberauth:guardian:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Guardian'"], "packageName": "guardian", "packageURL": "pkg:hex/guardian", "product": "guardian", "programFiles": ["lib/guardian.ex"], "programRoutines": [{"name": "'Elixir.Guardian':revoke/3"}], "repo": "https://github.com/ueberauth/guardian", "vendor": "ueberauth", "versions": [{"lessThan": "2.4.1", "status": "affected", "version": "1.0.0", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:ueberauth:guardian:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["'Elixir.Guardian'"], "packageName": "ueberauth/guardian", "packageURL": "pkg:github/ueberauth/guardian", "product": "guardian", "programFiles": ["lib/guardian.ex"], "programRoutines": [{"name": "'Elixir.Guardian':revoke/3"}], "repo": "https://github.com/ueberauth/guardian", "vendor": "ueberauth", "versions": [{"lessThan": "2bd7a8c29770d423d855c0a4965caa6c3e486901", "status": "affected", "version": "d65227145f72b290106c06cecbe42728fbf05fe2", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:ueberauth:guardian:*:*:*:*:*:*:*:*", "matchCriteriaId": "D61141EA-5786-4D7B-8780-55707F97E793", "versionEndExcluding": "2.4.1", "versionStartIncluding": "1.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper Verification of Cryptographic Signature in ueberauth guardian allows an unauthenticated attacker to revoke a victim's session with a forged token.\n\nGuardian.revoke/3 in lib/guardian.ex decodes the supplied token with peek/1, which performs no signature verification (it only base64-decodes the JWT header and payload). The resulting unverified claims are forwarded directly to the configured token module's revoke callback and the implementation's on_revoke callback, a state-mutating sink. The sibling operations refresh/2 and exchange/4 both call decode_and_verify first, so the signature is checked before anything acts on the claims; revoke/3 is the only state-mutating path that acts on claims without verifying the signature.\n\nAn attacker who knows or guesses a victim's identifying claim values (jti, sub) can forge a JWT carrying those claims, sign it with an arbitrary key, and submit it to any endpoint that funnels a caller-supplied token into Guardian.revoke/3 (the standard logout / session-revocation pattern). When the token module mutates state keyed by the claims (whitelist deletion or blacklist insertion, for example a GuardianDb-style store), the victim's legitimate session is evicted. This is an unauthenticated session-revocation denial of service; the attacker never needs the signing secret.\n\nThis issue affects guardian: from 1.0.0 before 2.4.1."}], "id": "CVE-2026-55735", "lastModified": "2026-08-06T14:25:11.683", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "[email protected]", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55735", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-03T19:29:43.841542Z", "version": "2.0.3"}}]}, "published": "2026-08-01T19:16:42.510", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Third Party Advisory"], "url": "https://cna.erlef.org/cves/CVE-2026-55735.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch"], "url": "https://github.com/ueberauth/guardian/commit/2bd7a8c29770d423d855c0a4965caa6c3e486901"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Exploit", "Patch", "Vendor Advisory"], "url": "https://github.com/ueberauth/guardian/security/advisories/GHSA-7975-hp3r-5qhv"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Third Party Advisory"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-55735"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Patch", "Vendor Advisory"], "url": "https://github.com/ueberauth/guardian/security/advisories/GHSA-7975-hp3r-5qhv"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.0.0,2.4.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "guardian", "source": "cna", "vendor": "ueberauth"}, "product": "guardian", "vendor": "ueberauth"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d65227145f72b290106c06cecbe42728fbf05fe2,2bd7a8c29770d423d855c0a4965caa6c3e486901)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "guardian", "source": "cna", "vendor": "ueberauth"}, "product": "guardian", "vendor": "ueberauth"}], "created": "2026-08-02T20:31:28.054128+00:00", "updated": "2026-08-03T09:45:04.448816+00:00", "vendors": ["ueberauth", "ueberauth$PRODUCT$guardian"]}