CVE-2026-105118

OpenAM before 16.1.3 Open Redirect via Unverified id_token_hint in endSession

State: Published
Severity: 2.3 Low
Published: Oct 3, 2026
Updated: Oct 5, 2026
Reserved: Oct 3, 2026

Description

OpenAM before 16.1.3 contains an open redirect vulnerability that allows unauthenticated attackers to redirect users by supplying an unverified id_token_hint to the /oauth2/connect/endSession endpoint. Attackers can name any realm client in a forged hint to redirect victims to any registered post-logout URI, enabling phishing that borrows the OpenAM host's trust.

Scores

CVSS	Score	Vector	Source
4.0	2.3 Low	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N	VulnCheck
3.1	4.7 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N	VulnCheck

Weaknesses

CWE-347 Improper Verification of Cryptographic Signature

Affected Products

Product	Versions
OpenAMOpenIdentityPlatform	before 16.1.3Affected 16.1.3Not affected

References

GitHub Security Advisory (GHSA-6f8c-crwq-jqm3)vendor-advisory
VulnCheck Advisory: OpenAM before 16.1.3 Open Redirect via Unverified id_token_hint in endSessionthird-party-advisory

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