pac4j-oidc before 6.5.6 Authentication Bypass via Access Token Substitution (CVE-2026-82462) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-82462

pac4j-oidc before 6.5.6 Authentication Bypass via Access Token Substitution

Answer in brief

CVE-2026-82462 records a Unknown severity vulnerability in pac4j-oidc before 6.5.6 Authentication Bypass via Access Token Substitution. The current sources do not mark it as known exploited. The current feed maps pac4j/pac4j (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 29, 2026Updated Aug 29, 2026Source checked Aug 29, 2026First seen by HOL Aug 29, 2026Material review Aug 29, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps pac4j/pac4j (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
pac4j/pac4jgeneric	>=0 <6.5.6	6.5.6

Recommended response

Check inventory. Check lockfiles and deployed manifests for pac4j/pac4j.
Review the reported fix. Update pac4j/pac4j to 6.5.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 29, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.