CVE-2025-4979: gitlab (CVSS 4.9)

Description

An issue has been discovered in GitLab CE/EE affecting all versions before 17.10.7, 17.11 before 17.11.3, and 18.0 before 18.0.1. An attacker may be able to reveal masked or hidden CI variables (that they did not author) in the WebUI, by simply creating their own variable and observing the HTTP response.

Is your site exposed to CVE-2025-4979?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

4.9

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Weakness Type (CWE)

CWE-1220 CWE-1220

Affected Products

Vendor	Product	Versions
gitlab	gitlab	< 17.10.7
gitlab	gitlab	< 17.10.7
gitlab	gitlab	17.11.0 — 17.11.3
gitlab	gitlab	17.11.0 — 17.11.3
gitlab	gitlab	All
gitlab	gitlab	All

References

Other References

https://gitlab.com/gitlab-org/gitlab/-/issues/524455

Frequently Asked Questions

What is CVE-2025-4979? +

An issue has been discovered in GitLab CE/EE affecting all versions before 17.10.7, 17.11 before 17.11.3, and 18.0 before 18.0.1. An attacker may be able to reveal masked or hidden CI variables (that they did not author) in the WebUI, by simply creating their own variable and observing the HTTP response. It has a CVSS v3.1 base score of 4.9 (MEDIUM).

How severe is CVE-2025-4979? +

CVE-2025-4979 has a CVSS v3.1 score of 4.9 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-4979? +

CVE-2025-4979 affects products from gitlab, specifically: gitlab. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-4979? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2021-46747

Insufficient granularity of access control in ASP (AMD Secure Processor) may allow an attacker with an untrusted user space application …

CVE-2025-3648

A vulnerability has been identified in the Now Platform that could result in data being inferred without authorization. Under certain …

CVE-2024-21962

Improper Input Validation in the AMD RAID driver could allow an attacker to point to an arbitrary memory location potentially …

CVE-2026-86338

Ash field_policies are documented to protect against filter-based information disclosure: when a field the actor may not see is referenced …

CVE-2026-78230

AshAi exposes Ash read actions to language-model tool calls. The read tool accepts an aggregate result type (min, max, sum, …

CVE-2026-78216

AshLua exposes Ash read actions to Lua scripts run through an eval action. A read call accepts an operation (list, …

CVE-2025-4979