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CVE-2025-12029

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

HIGH
8
CVSS Score
Published: December 11, 2025 at 07:32 AM UTC
Updated: October 14, 2026 at 09:10 PM UTC
1 product affected across 1 vendorGitLab

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Severity
HIGH8
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.11 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have, under certain circumstances, allowed an unauthenticated user to perform unauthorized actions on behalf of another user by injecting malicious external scripts into the Swagger UI."

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

GitLab· GitLabmaven
95%
15.11.0 ≤ v < 18.4.618.5.0 ≤ v < 18.5.418.6.0 ≤ v < 18.6.215.1118.518.6
Affected range stops below 18.4.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 18.5.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 18.6.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Issue TrackingPermissions RequiredBroken Link
Source: cverecord
https://gitlab.com/gitlab-org/gitlab/-/issues/577975
Technical DescriptionExploitPermissions Required
Source: cverecord
https://hackerone.com/reports/3317485
Release NotesVendor Advisory
Source: cverecord
https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8HIGHGitLab
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79

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