CVE-2026-3254

3.5 LOW 0.2% exploit odds No fix listed Other Browser & mail

What it is

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.

At a glance

Exploitability: Can be exploited over the network with a low-privilege account, but needs a user to act. Limited direct impact.
Exploit odds: 0.2% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2026-04-22 17:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 10:43 UTC Last updatedMost recent change to the record

Details

Published: 2026-04-22 17:16 UTC
Last modified: 2026-06-17 10:43 UTC
Exploit probability: 0.2% · EPSS, next 30 days
Weakness: CWE-1021
Record status: Analyzed

Affected

GitLab 18.11.0

Attack profile CVSS 3.1 · 3.5

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: Low
Availability: None

Raw vector

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

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References

NVD record · CVE.org record