Vulnerability · Published Oct 3, 2026 · Assigned by VulnCheck

CVE-2026-105118OpenAM before 16.1.3 Open Redirect via Unverified id_token_hint in endSession

Medium 4.7

In plain English

A medium-severity security flaw in OpenAM from OpenIdentityPlatform. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).

Severity (CVSS 3.1)4.7Medium

Exploit odds (30 days)0.1%top 99.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
OpenIdentityPlatform	OpenAM	0 – before 16.1.3

Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

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 endSession third-party-advisory