CVE-2026-3254

Name: CVE-2026-3254
Creator: NVD / NIST
Published: 2026-04-22T17:16:43.433+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.5/10EPSS 0.15%

Last modified Jun 17, 2026

CVE-2026-3254 is a low-severity vulnerability rated 3.5/10 on the CVSS scale. 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.. EPSS estimates a 0.15% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

3.5/10

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

EPSS Probability

0.15%

4.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1021

Affected Software

Vendor	Product	Versions
Gitlab	Gitlab	18.11.0

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/591587Broken Link
https://hackerone.com/reports/3572752Permissions Required

Timeline

Published: Apr 22, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-3254?

How severe is CVE-2026-3254?

CVE-2026-3254 has a CVSS score of 3.5/10 (LOW severity). The EPSS model estimates a 0.15% probability of exploitation in the next 30 days.

How do I fix CVE-2026-3254?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-3254?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST