CVE-2026-82462— pac4j-oidc before 6.5.6 Authentication Bypass via Access Token Substitution
Quick assessment
Affected
pac4j pac4j
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
pac4j-oidc 在 6.5.6 之前的版本在接受 OIDC 回调时，允许仅携带访问令牌（access token）而未经过授权码或 ID 令牌校验。攻击者可以利用为其他客户端签发的访问令牌来创建经过身份验证的会话，而系统未对颁发者（issuer）、受众（audience）、nonce 或主题（subject）进行正确校验。
Possible ATT&CK Techniques 1 AI
T1557.005
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I. Basic Information for CVE-2026-82462
Vulnerability Information
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Vulnerability Title
pac4j-oidc before 6.5.6 Authentication Bypass via Access Token Substitution
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-82462
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-82462 (1)
Security Blog Posts for CVE-2026-82462 (1)
Vendor Pages for CVE-2026-82462 (1)
Same Patch Batch · pac4j · 2026-08-29 · 5 CVEs total
| CVE-2026-82463 | 8.1 HIGH | pac4j-core before 6.5.6 Authorization Bypass via Reversed Profile Type Check |
| CVE-2026-82461 | 8.1 HIGH | pac4j-oidc before 6.5.6 Privilege Escalation via Unverified Keycloak Access Token |
| CVE-2026-82464 | 6.1 MEDIUM | pac4j-core before 6.5.6 Open Redirect via Backslash Logout |
| CVE-2026-82465 | 5.3 MEDIUM | pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequest |
IV. Related Vulnerabilities
Same product: pac4j
-
CVE-2026-82464
pac4j-core before 6.5.6 Open Redirect via Backslash Logout -
CVE-2026-82465
pac4j-saml before 6.5.6 Session Destruction via Unsigned Log -
CVE-2026-82463
pac4j-core before 6.5.6 Authorization Bypass via Reversed Pr -
CVE-2026-82461
pac4j-oidc before 6.5.6 Privilege Escalation via Unverified -
CVE-2026-40459
LDAP Injection in PAC4J
Same vendor: pac4j
-
CVE-2026-82464
pac4j-core before 6.5.6 Open Redirect via Backslash Logout -
CVE-2026-82465
pac4j-saml before 6.5.6 Session Destruction via Unsigned Log -
CVE-2026-82463
pac4j-core before 6.5.6 Authorization Bypass via Reversed Pr -
CVE-2026-82461
pac4j-oidc before 6.5.6 Privilege Escalation via Unverified -
CVE-2026-40459
LDAP Injection in PAC4J
Same weakness: CWE-345
-
CVE-2026-82465
pac4j-saml before 6.5.6 Session Destruction via Unsigned Log -
CVE-2026-82017
IGEL OS 12 / 11 Boot Registry Parameter Injection via Unsign -
CVE-2026-81706
openssl_encrypt before 1.4.9 Key Substitution via Identity S -
CVE-2026-81702
openssl_encrypt before 1.4.9 Key Substitution via Identity L -
CVE-2026-55663
mediasoup: SCTP state cookie lacks cryptographic authenticat
V. Comments for CVE-2026-82462
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