CVE-2026-4527: CSRF in GitLab Allows Unauthorized Jira Subscriptions
Platform
gitlab
Component
gitlab
Fixed in
18.11.3
CVE-2026-4527 describes a Cross-Site Request Forgery (CSRF) vulnerability discovered in GitLab Community Edition (CE) and Enterprise Edition (EE). This flaw allows an unauthenticated attacker to create unauthorized Jira subscriptions for a targeted user's namespace by exploiting a lack of CSRF protection. The vulnerability impacts GitLab versions from 11.10.0 through 18.11.3, with a fix available in version 18.11.3.
Impact and Attack Scenarios
The primary impact of CVE-2026-4527 is the potential for unauthorized Jira subscriptions to be created within a GitLab instance. An attacker could craft a malicious link and, if a targeted user clicks it, automatically subscribe that user's namespace to a Jira instance controlled by the attacker. This could lead to sensitive data being inadvertently shared with the attacker's Jira system, potentially exposing project information, code, and other confidential details. While the vulnerability requires user interaction (clicking a malicious link), the lack of authentication needed to trigger the subscription significantly broadens the attack surface. This is similar to other CSRF vulnerabilities where user actions are leveraged to perform unauthorized operations.
Exploitation Context
CVE-2026-4527 was published on May 14, 2026. Its severity is rated as MEDIUM (CVSS 6.5). No public Proof-of-Concept (POC) exploits have been identified at the time of writing. There are no indications of active campaigns targeting this vulnerability. Monitor GitLab security advisories and CISA alerts for any updates regarding exploitation attempts.
Threat Intelligence
Exploit Status
CISA SSVC
CVSS Vector
What do these metrics mean?
- Attack Vector
- Network — remotely exploitable over the internet. No physical or local access required. Widest attack surface.
- Attack Complexity
- Low — no special conditions required. Attacker can exploit reliably without depending on rare configurations or timing.
- Privileges Required
- None — unauthenticated. No login or credentials needed to exploit.
- User Interaction
- Required — victim must take an action: open a file, click a link, or visit a crafted page.
- Scope
- Unchanged — impact is limited to the vulnerable component itself.
- Confidentiality
- High — complete confidentiality loss. Attacker can read all data: credentials, keys, personal data.
- Integrity
- None — no integrity impact. Attacker cannot modify data.
- Availability
- None — no availability impact. Service remains fully operational.
Affected Software
Weakness Classification (CWE)
Timeline
- Reserved
- Published
Mitigation and Workarounds
The primary mitigation for CVE-2026-4527 is to upgrade GitLab to version 18.11.3 or later. This version includes the necessary CSRF protection to prevent unauthorized Jira subscriptions. If immediate upgrading is not possible, consider implementing a Web Application Firewall (WAF) rule to block requests containing the vulnerable Jira subscription endpoint. Carefully review user permissions and access controls within GitLab to minimize the potential impact if the vulnerability is exploited before patching. There are no specific rollback steps beyond reverting to a previous, patched GitLab version.
How to fix
Actualice GitLab a la versión 18.9.7 o posterior, 18.10.6 o posterior, o 18.11.3 o posterior para mitigar la vulnerabilidad CSRF. Esta actualización corrige la falta de protección CSRF que permitía la creación de suscripciones de Jira no autorizadas.
Frequently asked questions
What is CVE-2026-4527 — CSRF in GitLab?
CVE-2026-4527 is a Cross-Site Request Forgery (CSRF) vulnerability in GitLab CE/EE allowing unauthenticated users to create unauthorized Jira subscriptions for a targeted user's namespace.
Am I affected by CVE-2026-4527 in GitLab?
You are affected if you are running GitLab CE or EE versions 11.10.0 through 18.11.3. Upgrade to version 18.11.3 or later to resolve the issue.
How do I fix CVE-2026-4527 in GitLab?
Upgrade GitLab to version 18.11.3 or later. As a temporary workaround, implement a WAF rule to block requests to the vulnerable Jira subscription endpoint.
Is CVE-2026-4527 being actively exploited?
There are currently no indications of active exploitation campaigns targeting CVE-2026-4527, but continuous monitoring is recommended.
Where can I find the official GitLab advisory for CVE-2026-4527?
Refer to the official GitLab security advisory for CVE-2026-4527 on the GitLab blog: [https://about.gitlab.com/security/advisories/](https://about.gitlab.com/security/advisories/)
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