CVE-2026-4524: Authentication Bypass in GitLab
Platform
gitlab
Component
gitlab
Fixed in
18.11.3
CVE-2026-4524 describes an authentication bypass vulnerability discovered in GitLab Community Edition (CE) and Enterprise Edition (EE). This flaw allows authenticated users to circumvent authorization checks and gain unauthorized access to confidential issue content within public projects. The vulnerability impacts versions 18.9.1 through 18.11.3 and has been resolved in version 18.11.3.
Impact and Attack Scenarios
Successful exploitation of CVE-2026-4524 could lead to unauthorized disclosure of sensitive information contained within GitLab issues. Attackers could potentially access confidential project details, internal discussions, or proprietary data that should only be visible to authorized personnel. While the vulnerability requires authentication, the ease of bypassing authorization checks significantly expands the potential attack surface. This could result in data breaches, reputational damage, and potential legal ramifications for organizations relying on GitLab for project management and collaboration.
Exploitation Context
CVE-2026-4524 was published on May 14, 2026. As of this date, there are no publicly known active campaigns exploiting this vulnerability. The vulnerability is not currently listed on KEV (Known Exploited Vulnerabilities). The EPSS (Exploit Prediction Scoring System) score is pending evaluation, indicating an unknown probability of exploitation. Monitor security advisories and threat intelligence feeds 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
- Low — any valid user account is sufficient. Basic authenticated access required.
- User Interaction
- None — attack is automatic and silent. Victim does nothing: no click, no file open.
- 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-2026-4524 is to immediately upgrade GitLab instances to version 18.11.3 or later. If upgrading is not immediately feasible, consider implementing stricter access controls within GitLab to limit the potential impact of unauthorized access. Review project permissions and ensure that only authorized users have access to sensitive issue content. While a WAF or proxy cannot directly prevent this bypass, it could potentially be configured to flag suspicious access patterns to confidential issue data. After upgrading, confirm the fix by attempting to access confidential issue content in a public project with a standard user account; access should be denied.
How to fix
Actualice GitLab a la versión 18.9.7 o superior, 18.10.6 o superior, o 18.11.3 o superior para mitigar la vulnerabilidad. Esta actualización corrige una falla de autorización que permitía el acceso no autorizado a contenido confidencial de issues en proyectos públicos.
Frequently asked questions
What is CVE-2026-4524 — Authentication Bypass in GitLab?
CVE-2026-4524 is a medium severity vulnerability in GitLab CE/EE allowing authenticated users to access confidential issue content in public projects without proper authorization due to flawed authorization checks.
Am I affected by CVE-2026-4524 in GitLab?
You are affected if you are running GitLab CE/EE versions 18.9.1 through 18.11.3. Upgrade to 18.11.3 or later to mitigate the risk.
How do I fix CVE-2026-4524 in GitLab?
The recommended fix is to upgrade your GitLab instance to version 18.11.3 or a later version. Ensure you follow GitLab's upgrade procedures carefully.
Is CVE-2026-4524 being actively exploited?
As of May 14, 2026, there are no publicly known active campaigns exploiting CVE-2026-4524, but continuous monitoring is advised.
Where can I find the official GitLab advisory for CVE-2026-4524?
Refer to the official GitLab security advisory for CVE-2026-4524 on the GitLab website: [https://gitlab.com/security/advisories/](https://gitlab.com/security/advisories/)
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