Advisory record · GHSA-6929-8p9f-26jx

SimpleSAMLphp HTTP-Artifact TLS validator confusion allows cross-IdP authentication bypass

CVSS 8.7 HighEPSS 0.0047 · 41st percentile

Published by the GitHub Advisory Database at 2 Jul 2026, 20:25 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
simplesamlphp/saml2	Packagist	>=6.0.0, <6.2.1 \|\| >=5.0.0, <5.0.6 \|\| >=4.20.0, <4.20.2 \|\| <4.19.3	6.2.1, 5.0.6, 4.20.2, 4.19.3
simplesamlphp/saml2-legacy	Packagist	>=4.20.0, <4.20.2 \|\| <4.19.3	4.20.2, 4.19.3

Identifiers: GHSA-6929-8p9f-26jx · CVE-2026-49283 · PKSA-4y26-97zb-p98g · PKSA-yk3g-3g3t-ts6q
Weakness (CWE): CWE-295
Tags: Weak cryptography or TLS
Published: 2 Jul 2026
Updated: 4 Aug 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
8.7	High	3.1	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0047, the 41st percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 2 Jul 2026. New records show when each source confirmed them.

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.