CVE-2026-114618

{"id": "CVE-2026-114618", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-114618", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-10-29T12:28:44.727870Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 1.6}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "authlib", "product": "authlib", "versions": [{"status": "affected", "version": "< 1.9.0"}]}]}], "published": "2026-10-22T22:18:04.747", "references": [{"url": "https://github.com/authlib/authlib/commit/e3bd41cb29dcfee434453b135ffb487884baeedf", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/authlib/authlib/pull/945", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/authlib/authlib/releases/tag/v1.9.0", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/authlib/authlib/security/advisories/GHSA-fch4-3c6x-j4gc", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/authlib/authlib/security/advisories/GHSA-fch4-3c6x-j4gc", "tags": ["Exploit", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-287"}, {"lang": "en", "value": "CWE-1188"}]}], "descriptions": [{"lang": "en", "value": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, the default RFC 7523 JWTBearerGrant.get_audiences() returns an empty list, causing JWTBearerGrant.verify_claims() to require only that an aud claim exists without matching the current authorization server. An attacker holding a legitimate assertion for another service can present it to a server that shares the signing key and uses the default grant, obtaining an access token across a trust boundary. Implementations that override get_audiences() with the server's valid audience identifiers are not affected. This issue is fixed in version 1.9.0."}], "lastModified": "2026-10-29T14:53:01.947", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BA8E921E-7ECA-48FD-91C8-B98A9513EAB4", "versionEndExcluding": "1.9.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}