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CVE-2026-6335: XSS in GitLab 18.11
traduction en cours…Plateforme
gitlab
Composant
gitlab
Corrigé dans
18.11.3
CVE-2026-6335 is a Cross-Site Scripting (XSS) vulnerability affecting GitLab Community Edition (CE) and Enterprise Edition (EE). This flaw allows an authenticated user, under specific conditions, to execute arbitrary code within the browser session of another user. The vulnerability impacts GitLab versions 18.11.0 through 18.11.3, and a fix is available in version 18.11.3.
Impact et Scénarios d'Attaquetraduction en cours…
Successful exploitation of CVE-2026-6335 could allow an attacker to impersonate another user within GitLab, potentially gaining access to sensitive data or performing actions on their behalf. This could include viewing private repositories, modifying project settings, or even accessing administrative functions if the targeted user possesses elevated privileges. The impact is amplified if the targeted user has access to critical infrastructure or sensitive data, leading to a broader compromise of the GitLab instance. The ability to execute code within another user's browser session represents a significant security risk, as it bypasses traditional authentication mechanisms.
Contexte d'Exploitationtraduction en cours…
CVE-2026-6335 was published on 2026-05-14. As of this date, there are no publicly known active campaigns exploiting this vulnerability. No public Proof-of-Concept (POC) code has been released. The vulnerability is not listed on KEV (Kernel Exploit Vulnerability) and has a low EPSS (Exploit Prediction Scoring System) score, indicating a relatively low probability of exploitation in the wild.
Renseignement sur les Menaces
Statut de l'Exploit
Vecteur CVSS
Que signifient ces métriques?
- Attack Vector
- Réseau — exploitable à distance via internet. Aucun accès physique ou local requis.
- Attack Complexity
- Faible — aucune condition spéciale requise. Exploitable de manière fiable.
- Privileges Required
- Faible — tout compte utilisateur valide est suffisant.
- User Interaction
- Requise — la victime doit ouvrir un fichier, cliquer sur un lien ou visiter une page.
- Scope
- Modifié — l'attaque peut pivoter au-delà du composant vulnérable.
- Confidentiality
- Faible — accès partiel ou indirect à certaines données.
- Integrity
- Faible — l'attaquant peut modifier certaines données avec un impact limité.
- Availability
- Aucun — aucun impact sur la disponibilité.
Logiciel Affecté
Classification de Faiblesse (CWE)
Chronologie
- Réservé
- Publiée
Mitigation et Contournementstraduction en cours…
The primary mitigation for CVE-2026-6335 is to immediately upgrade GitLab to version 18.11.3 or later. If upgrading is not immediately feasible, consider implementing stricter input validation on user-supplied data within GitLab. While not a direct fix, this can help reduce the attack surface. Review GitLab's security configuration and ensure that all security features are enabled and properly configured. Monitor GitLab logs for any suspicious activity that might indicate exploitation attempts.
Comment corrigertraduction en cours…
Actualice GitLab a la versión 18.11.3 o posterior para mitigar la vulnerabilidad de Cross-Site Scripting (XSS). Esta actualización corrige la sanitización inadecuada de la entrada, previniendo la ejecución de código arbitrario en el navegador de otros usuarios.
Questions fréquentestraduction en cours…
What is CVE-2026-6335 — XSS in GitLab 18.11?
CVE-2026-6335 is a Cross-Site Scripting (XSS) vulnerability in GitLab CE/EE versions 18.11.0 through 18.11.3. It allows an authenticated user to potentially execute code in another user's browser session.
Am I affected by CVE-2026-6335 in GitLab 18.11?
If you are running GitLab CE or EE versions 18.11.0, 18.11.1, 18.11.2, or 18.11.3, you are potentially affected by this vulnerability. Upgrade to 18.11.3 or later.
How do I fix CVE-2026-6335 in GitLab 18.11?
The recommended fix is to upgrade GitLab to version 18.11.3 or a later version. This patch addresses the improper sanitization issue.
Is CVE-2026-6335 being actively exploited?
As of 2026-05-14, there are no publicly known active campaigns exploiting this vulnerability, and no public POC code is available.
Where can I find the official GitLab advisory for CVE-2026-6335?
Refer to the official GitLab security advisory for CVE-2026-6335 on the GitLab website: [https://gitlab.com/security/advisories/](https://gitlab.com/security/advisories/)
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