CVE-2024-4024: Authentication Bypass by Assumed-Immutable Data in GitLab

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 14.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-04-25 · updated 2026-06-17
Weakness: CWE-302

Description

An issue has been discovered in GitLab CE/EE affecting all versions starting from 7.8 before 16.9.6, all versions starting from 16.10 before 16.10.4, all versions starting from 16.11 before 16.11.1. Under certain conditions, an attacker with their Bitbucket account credentials may be able to take over a GitLab account linked to another user's Bitbucket account, if Bitbucket is used as an OAuth 2.0 provider on GitLab.

Affected products

GitLab: from 7.8.0 before 16.9.6; from 16.10.0 before 16.10.4; 16.11.0 — fixed in 16.10.4, 16.9.6

How to fix

Upgrade to a fixed version: GitLab 16.10.4, 16.9.6. Check the vendor advisory for mitigations.

References

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