CVE-2026-13543 Documenso Google OAuth Login handle-oauth-callback-url.ts improper authentication
Attackers can bypass authentication in Documenso's Google OAuth callback, potentially taking over user accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-13543?
CVE-2026-13543 is a medium-severity authentication bypass vulnerability in Documenso, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was detected in Documenso up to 2.11.0. Affected by this vulnerability is an unknown functionality of the file packages/auth/server/lib/utils/handle-oauth-callback-url.ts of the component Google OAuth Login. The manipulation results in improper authentication. It is possible to launch the attack remotely. This attack is characterized by high complexity. The exploitation appears to be difficult. The exploit is now public and may be used. The pull request to fix this issue awaits acceptance.
Weakness: CWE-287
Which versions are affected by CVE-2026-13543?
How do I fix CVE-2026-13543?
No fix has been published for CVE-2026-13543 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-13543 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13543 exists.
Sources
Also known as GHSA-3hjr-gmh6-w2qr.