CVE-2023-3904: Improper Validation of Specified Type of Input in GitLab

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-15 · updated 2026-06-17
Weakness: CWE-1287

Description

An issue has been discovered in GitLab EE affecting all versions starting before 16.4.4, all versions starting from 16.5 before 16.5.4, all versions starting from 16.6 before 16.6.2. It was possible to overflow the time spent on an issue that altered the details shown in the issue boards.

Affected products

GitLab: before 16.4.4; from 16.5 before 16.5.4; from 16.6 before 16.6.2 — fixed in 16.4.4, 16.5.4, 16.6.2

How to fix

Upgrade to a fixed version: GitLab 16.4.4, 16.5.4, 16.6.2. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/gitlab/-/issues/418226
https://hackerone.com/reports/2053154
https://gitlab.com/gitlab-org/gitlab/-/issues/418226
https://hackerone.com/reports/2053154

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