CVE-2025-2615: Insertion of Sensitive Information Into Sent Data in GitLab

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-11-15 · updated 2026-10-19
Weakness: CWE-201

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.7 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2, that could have allowed a blocked user to access sensitive information by establishing GraphQL subscriptions through WebSocket connections.

Affected products

GitLab: from 16.7.0 before 18.3.6; from 18.4.0 before 18.4.4; from 18.5.0 before 18.5.2 — fixed in 18.3.6, 18.4.4, 18.5.2

How to fix

Upgrade to a fixed version: GitLab 18.3.6, 18.4.4, 18.5.2. Check the vendor advisory for mitigations.

References

https://about.gitlab.com/releases/2025/11/12/patch-release-gitlab-18-5-2-released/
https://gitlab.com/gitlab-org/gitlab/-/issues/526360
https://hackerone.com/reports/3049150

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