BaseFortify

Publication date: 2025-12-11

Last updated on: 2025-12-16

Assigner: GitLab Inc.

Description

GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-12-11

Last Modified

2025-12-16

Generated

2026-07-06

AI Q&A

2025-12-11

EPSS Evaluated

2026-07-05

NVD

CVE-2025-8405

Affected Vendors & Products

Vendor	Product	Version / Range
gitlab	gitlab_ce	18.6.2
gitlab	gitlab_ce	18.4.6
gitlab	gitlab_ce	18.5.4

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-116	The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

Attack-Flow Graph

Executive Summary

This vulnerability in GitLab CE/EE allows an authenticated user to perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.

Impact Analysis

The vulnerability can lead to unauthorized actions being performed by an attacker with authenticated access, potentially compromising user accounts and the integrity of the system.

Mitigation Strategies

To mitigate this vulnerability, update GitLab CE/EE to a fixed version: 18.4.6 or later if using 18.4.x, 18.5.4 or later if using 18.5.x, or 18.6.2 or later if using 18.6.x. Ensure that only trusted users have authenticated access to GitLab until the update is applied.

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