# CVE-2026-3254

## Summary

- **CVE ID:** CVE-2026-3254
- **Severity:** LOW
- **CVSS Score:** 3.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N)
- **CWE:** CWE-1021
- **Published:** Apr 22, 2026
- **Last Modified:** Apr 22, 2026

## Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.1 that under certain conditions could have allowed an authenticated user to load unauthorized content into another user's browser due to improper input validation in the Mermaid sandbox.

## Affected Products

- GitLab — GitLab (18.11)

## References

- [CNA](https://hackerone.com/reports/3572752)
- [CNA](https://gitlab.com/gitlab-org/gitlab/-/work_items/591587)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.15%
- **EPSS Percentile:** 4.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._