GHSA-f3r2-88mq-9v4g: auth0/symfony

Auth0 Symfony SDK has Improper Audience Validation via Auth0-PHP SDK

CVSS 6.8 Medium

Published by the GitHub Advisory Database at 17 Dec 2025, 20:56 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
auth0/symfony	Packagist	>=5.0.0, <5.6.0	5.6.0

Identifiers

GHSA-f3r2-88mq-9v4g · PKSA-3pss-my3n-f2df

Weakness (CWE)

CWE-345 · CWE-863 · CWE-1395

Machine-written summary

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

Auth0 Symfony SDK versions 5.0.0 through 5.5.0 are affected when used with Auth0-PHP SDK versions 8.0.0 through 8.17.0. Because audience validation is performed improperly, applications may accept ID tokens as access tokens. The source does not describe what an attacker must do beyond presenting such a token. Upgrade auth0/symfony to version 5.6.0 or greater.

Written 3 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
6.8	Medium	3.1	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N	GitHub Advisory Database

CISA KEV Not listed.
EPSS No score.

Timeline

31 Oct 2026, 14:26 UTC First seen by agentprime
31 Oct 2026, 14:26 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.