CVE-2026-82462pac4j-oidc before 6.5.6 Authentication Bypass via Access Token Substitution
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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pac4j-oidc before 6.5.6 accepts OIDC callbacks carrying only an access token without authorization code or ID token validation. Attackers can substitute access tokens minted for other clients to create authenticated sessions without proper issuer, audience, nonce, or subject verification.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Weakness (CWE)
- CWE-345
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Awaiting Analysis
- Record last updated
- Aug 31, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
pac4j pac4j pac4j:pac4j (from the name) | before 6.5.6 | CNA record |
References
- https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237epatch
- https://www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.htmlvendor-advisory
- https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-oidc/src/main/java/org/pac4j/oidc/credentials/extractor/OidcCredentialsExtractor.javatechnical-description
- https://github.com/pac4j/pac4jproduct
- https://www.vulncheck.com/advisories/pac4j-oidc-before-6.5.6-authentication-bypass-via-access-token-substitutionthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.