Stored XSS via Kubernetes proxy input validation
Published Jan 14, 2026 · Updated Jan 14, 2026
Stored XSS in GitLab CE/EE 15.10 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 lets remote authenticated users run script. The Kubernetes proxy persists attacker-controlled content after improper input validation, but GitLab has not disclosed the affected field or rendering operation. Exploitation requires an authenticated account, high-complexity conditions, and a victim to load the stored content, enabling script execution in that victim's browser context.
Summary
What happened
Stored XSS in GitLab CE/EE 15.10 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 lets remote authenticated users run script. The Kubernetes proxy persists attacker-controlled content after improper input validation, but GitLab has not disclosed the affected field or rendering operation. Exploitation requires an authenticated account, high-complexity conditions, and a victim to load the stored content, enabling script execution in that victim's browser context.
The record
- CVE
- CVE-2025-11224
- Published
- Jan 14, 2026
- Updated
- Jan 14, 2026
- Vendor
- GitLab
- Product
- GitLab
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 14, 2026CVE publishedPublication date reported by the CVE source.
- Jan 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=15.10 <18.3.6
- Affected versionversion=18.4 <18.4.4
- Affected versionversion=18.5 <18.5.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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