Description
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.
Published: 2026-08-29
Score: 6.9 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Sat, 29 Aug 2026 16:45:00 +0000

Type Values Removed Values Added
Description 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.
Title pac4j-oidc before 6.5.6 Authentication Bypass via Access Token Substitution
First Time appeared Pac4j
Pac4j pac4j
Weaknesses CWE-345
CPEs cpe:2.3:a:pac4j:pac4j:*:*:*:*:*:*:*:*
Vendors & Products Pac4j
Pac4j pac4j
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-29T16:35:26.177Z

Reserved: 2026-08-29T14:11:00.606Z

Link: CVE-2026-82462

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-29T17:17:58.350

Modified: 2026-08-29T17:17:58.350

Link: CVE-2026-82462

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-29T17:30:12Z

Weaknesses
  • CWE-345

    Insufficient Verification of Data Authenticity