Vulnerability · Published Dec 10, 2025 · Assigned by INCIBE
CVE-2025-13953Bypass in the authentication method of the GTT Sistema de Información Tributario application
Critical 9.3
In plain English
A critical-severity authentication bypass by spoofing in Sistema de Información Tributario from GTT. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GTT | Sistema de Información Tributario | All versions |
Weakness: CWE-290 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N