Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab (CVE-2026-10086)
A cross-site scripting (XSS) vulnerability exists in GitLab Enterprise Edition versions from 16.4 up to but not including 18.11.6, 19.0 up to but not including 19.0.3, and 19.1 up to but not including 19.1.1. This flaw allows an authenticated user with developer-role permissions to execute arbitrary client-side code in another user's session due to improper sanitization of user input. GitLab has released patches to remediate this issue.
AI Analysis
Technical Summary
CVE-2026-10086 is a cross-site scripting vulnerability in GitLab EE that affects versions >=16.4.0 <18.11.6, >=19.0.0 <19.0.3, and >=19.1.0 <19.1.1. Under certain conditions, an authenticated user with developer permissions could inject and execute arbitrary client-side code in the context of another user's session because of improper neutralization of user-supplied input during web page generation. This vulnerability has been addressed by GitLab through official patches in versions 18.11.6, 19.0.3, and 19.1.1.
Potential Impact
An attacker with developer-role permissions could exploit this vulnerability to execute arbitrary JavaScript in the context of another user's session, potentially leading to session hijacking, unauthorized actions, or data exposure within the affected GitLab instance. The impact is limited to authenticated users with developer permissions and does not affect unauthenticated users.
Mitigation Recommendations
GitLab has released official patches that fix this vulnerability in versions 18.11.6, 19.0.3, and 19.1.1. Users should upgrade affected GitLab EE instances to these versions or later to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab (CVE-2026-10086)
Description
A cross-site scripting (XSS) vulnerability exists in GitLab Enterprise Edition versions from 16.4 up to but not including 18.11.6, 19.0 up to but not including 19.0.3, and 19.1 up to but not including 19.1.1. This flaw allows an authenticated user with developer-role permissions to execute arbitrary client-side code in another user's session due to improper sanitization of user input. GitLab has released patches to remediate this issue.
Affected software
pkg:bitnami/gitlabRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-10086 is a cross-site scripting vulnerability in GitLab EE that affects versions >=16.4.0 <18.11.6, >=19.0.0 <19.0.3, and >=19.1.0 <19.1.1. Under certain conditions, an authenticated user with developer permissions could inject and execute arbitrary client-side code in the context of another user's session because of improper neutralization of user-supplied input during web page generation. This vulnerability has been addressed by GitLab through official patches in versions 18.11.6, 19.0.3, and 19.1.1.
Potential Impact
An attacker with developer-role permissions could exploit this vulnerability to execute arbitrary JavaScript in the context of another user's session, potentially leading to session hijacking, unauthorized actions, or data exposure within the affected GitLab instance. The impact is limited to authenticated users with developer permissions and does not affect unauthenticated users.
Mitigation Recommendations
GitLab has released official patches that fix this vulnerability in versions 18.11.6, 19.0.3, and 19.1.1. Users should upgrade affected GitLab EE instances to these versions or later to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BIT-gitlab-2026-10086
- Osv Schema Version
- 1.6.2
- Aliases
- ["CVE-2026-10086"]
- Ecosystems
- ["Bitnami"]
- Database Specific Severity
- Medium
Threat ID: 6a42ed7427e9c79719939377
Added to database: 06/29/2026, 22:11:00 UTC
Last enriched: 09/10/2026, 23:03:25 UTC
Last updated: 09/27/2026, 13:47:42 UTC
Views: 108
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