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CVE-2026-4527: GitLab can let attackers add fake Jira subscriptions

CVE-2026-4527 · published 5 months ago

Summary

All supported versions of GitLab Community and Enterprise may let someone who is not logged in create unwanted Jira subscription entries for a user simply by visiting a crafted link. This could give an attacker unwanted visibility into your project tracking or generate unwanted notifications. Update GitLab to the latest release or apply the provided security patch as soon as possible.

Original advisory text

Cross-Site Request Forgery (CSRF) in GitLab

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 11.10 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that could have allowed an unauthenticated user to create unauthorized Jira subscriptions for a targeted user's namespace via a specially crafted link due to missing CSRF protection.

References

https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-releas... URL
https://gitlab.com/gitlab-org/gitlab/-/work_items/594339 URL
https://hackerone.com/reports/3590487 Third Party Advisory
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4527.j... Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-4527 Vendor Advisory

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker partial control

Severity

6.5 Medium

Exploitation

<1% chance of attack within 30 days

Type

CWE-352Cross-Site Request Forgery (CSRF)

Timeline

Published14 May 2026

Updated29 Oct 2026

First seen14 May 2026

Sources

CVE-2026-4527 · NVD

CVE-2026-4527 · OSV

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