CVE-2025-13953 Bypass in the authentication method of the GTT Sistema de Información Tributario application
An attacker can bypass authentication in the GTT Tax Information System by impersonating a local WebSocket, allowing unauthorized access to any user account.
- 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-2025-13953?
CVE-2025-13953 is a critical authentication bypass vulnerability in GTT Sistema de Información Tributario, published on 10 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Bypass vulnerability in the authentication method in the GTT Tax Information System application, related to the Active Directory (LDAP) login method.
Authentication is performed through a local WebSocket, but the web application does not properly validate the authenticity or origin of the data received, allowing an attacker with access to the local machine or internal network to impersonate the legitimate WebSocket and inject manipulated information.
Exploiting this vulnerability could allow an attacker to authenticate as any user in the domain, without the need for valid credentials, compromising the confidentiality, integrity, and availability of the application and its data.
Weakness: CWE-290
Which versions are affected by CVE-2025-13953?
How do I fix CVE-2025-13953?
No fix has been published for CVE-2025-13953 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-2025-13953 being exploited?
There is no known exploitation of CVE-2025-13953 in the wild and no public exploit code.
Sources
Also known as GHSA-5773-h955-5w49.