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CVE-2026-82465— pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequest

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-saml 在 6.5.6 之前的版本中，未在 中强制校验 SAML LogoutRequest 消息的签名。当身份提供者（IdP）未发送 SessionIndex 时，仅凭 NameID 即可销毁会话。这使得未认证的 attackers 能够提交一个未签名的 LogoutRequest，并使用猜测的标识符（例如用作 NameID 的电子邮件地址）来终止受害者的 SAML 会话。

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
pac4j pac4j < 6.5.6 affected
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I. Basic Information for CVE-2026-82465

Vulnerability Information
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Vulnerability Title
pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequest
Source: CVE Program / CVE List V5
Vulnerability Description
pac4j-saml before 6.5.6 does not require signature validation of SAML LogoutRequest messages in SAML2LogoutValidator.validateLogoutRequest(). When an IdP sends no SessionIndex, a session can be destroyed based solely on the NameID, allowing an unauthenticated attacker to submit an unsigned LogoutRequest with a guessed identifier (e.g., an email address used as NameID) to terminate a victim's SAML session.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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

Vendor Product Affected Versions CPE Subscribe
pac4j pac4j 0 ~ 6.5.6 -

II. Public POCs for CVE-2026-82465

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III. Intelligence Information for CVE-2026-82465

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Patches & Fixes for CVE-2026-82465 (1)

Vendor Advisories for CVE-2026-82465 (1)

Security Blog Posts for CVE-2026-82465 (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-2026-82462 6.5 MEDIUM pac4j-oidc before 6.5.6 Authentication Bypass via Access Token Substitution
CVE-2026-82464 6.1 MEDIUM pac4j-core before 6.5.6 Open Redirect via Backslash Logout

IV. Related Vulnerabilities

Same product: pac4j
Same vendor: pac4j
Same weakness: CWE-345

V. Comments for CVE-2026-82465

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