CVE-2025-13953

Bypass in the authentication method of the GTT Sistema de Información Tributario application

Published Dec 10, 2025 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

The vulnerability has been fixed by disabling the Active Directory (LDAP) authentication method. The vulnerability is no longer exploitable at this time.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Gtt
Gtt tax Information System
Vendors & Products Gtt
Gtt tax Information System
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Bypass in the authentication method of the GTT Sistema de Información Tributario application
Weaknesses CWE-290
References
Metrics cvssV4_0

{'score': 9.3, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
INCIBE
Published
Updated
Dec 10, 2025, 4:39 PM
Reserved
Dec 3, 2025, 1:11 PM
Status
Deferred
Published
Dec 10, 2025, 12:16 PM
Modified
Oct 14, 2026, 9:10 PM