GHSA-pcgw-qcv5-h8ch: github.com/russellhaering/gosaml2

Unsigned SAML LogoutRequest Acceptance in gosaml2

CVSS 7.5 High

Published by the GitHub Advisory Database at 18 Mar 2026, 20:19 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
github.com/russellhaering/gosaml2	Go	<0.11.0	0.11.0

Identifiers

GHSA-pcgw-qcv5-h8ch · GO-2026-4764

Weakness (CWE)

CWE-347

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The gosaml2 package github.com/russellhaering/gosaml2, versions before 0.11.0, accepts unsigned SAML LogoutRequest messages in ValidateEncodedLogoutRequestPOST even when signature validation is enabled. An attacker who can reach the service provider's Single Logout endpoint over the network, without authentication, can forge a logout request for a user and end that user's session. Upgrade to version 0.11.0 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub Advisory Database

CISA KEV Not listed.
EPSS No score.

Timeline

31 Oct 2026, 14:14 UTC First seen by agentprime
31 Oct 2026, 14:14 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.