CVE-2025-8405
Improper Encoding or Escaping of Output in GitLab
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.
INFO
Published Date :
Dec. 11, 2025, 5:16 a.m.
Last Modified :
Dec. 12, 2025, 3:18 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | ceab7361-8a18-47b1-92ba-4d7d25f6715a | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update GitLab to the latest patched version.
- Apply vendor security updates promptly.
- Review code flow displays for injection vulnerabilities.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-8405.
| URL | Resource |
|---|---|
| https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/ | |
| https://gitlab.com/gitlab-org/gitlab/-/issues/558214 | |
| https://hackerone.com/reports/3270940 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-8405 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-8405
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-8405 vulnerability anywhere in the article.
-
CybersecurityNews
GitLab Patches Multiple Vulnerabilities that Allows Attackers to Trigger XSS and DoS Attack
Critical security patches on December 10, 2025, addressing ten significant vulnerabilities across its Community Edition and Enterprise Edition platforms. GitLab has released updated versions 18.6.2, 1 ... Read more
The following table lists the changes that have been made to the
CVE-2025-8405 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Dec. 11, 2025
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N Added CWE CWE-116 Added Reference https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/ Added Reference https://gitlab.com/gitlab-org/gitlab/-/issues/558214 Added Reference https://hackerone.com/reports/3270940