EUVD-2026-39171
GHSA-93jf-78vf-79px
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Network-delivered XSS needing victim interaction and conditional preconditions gives AV:N/AC:H/UI:R; attacker unauthenticated (PR:N); script in trusted origin changes scope (S:C) with high C/I and no availability impact.
Primary rating from Vendor (gitlab).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.10 before 18.11.6, 19.0 before 19.0.3, and 19.1 before 19.1.1 that under certain conditions could have allowed an unauthenticated user to execute arbitrary JavaScript in a user's browser session due to improper path validation under certain conditions.
Articles & Coverage 2
AnalysisAI
Cross-site scripting in GitLab CE/EE (18.10 through 18.11.5, 19.0 through 19.0.2, and 19.1.0) lets an unauthenticated attacker run arbitrary JavaScript in a victim's authenticated browser session by abusing improper path validation, but only under specific conditions and after a logged-in user interacts with attacker-controlled content. The CVSS 8.0 rating (scope-changed, high confidentiality and integrity impact) reflects that successful exploitation effectively hijacks the victim's GitLab session. No public exploit has been identified at time of analysis and the issue is not in CISA KEV, though a HackerOne report exists and GitLab shipped fixes in 18.11.6, 19.0.3, and 19.1.1.
Technical ContextAI
GitLab is a self-managed and SaaS DevOps platform (Git hosting, CI/CD, issue tracking) built as a large Ruby on Rails application with a heavily JavaScript-driven frontend. The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation), here reached via improper path validation: a route or resource path is not correctly canonicalized or sanitized before being reflected into the DOM, letting attacker-controlled data escape into an executable script context. Because the injected script runs inside the trusted GitLab origin, it inherits the victim's authenticated session, which is why the CVSS scope is Changed (S:C) - the vulnerable web component compromises the separate browser security context. Exact affected CPEs are not enumerated in the provided NVD data beyond the version ranges in the description.
RemediationAI
Upgrade to a fixed release: GitLab CE/EE 18.11.6, 19.0.3, or 19.1.1 (or later) depending on your branch - Vendor-released patches: 18.11.6 / 19.0.3 / 19.1.1, per https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-1-1-released/. Self-managed administrators should apply the patch release immediately, since GitLab.com is already remediated. If upgrading cannot be scheduled at once, reduce exposure by restricting network access to the GitLab web interface (VPN/IP allowlist) so untrusted users cannot deliver malicious links to authenticated staff, and reinforce a strict Content-Security-Policy to limit inline-script execution where supported - note that custom CSP changes can break legitimate GitLab UI features and integrations and must be tested. Advising users not to click untrusted GitLab links is a weak compensating control given UI:R is the only interaction barrier; patching is the only reliable fix. Track remediation via the work item at https://gitlab.com/gitlab-org/gitlab/-/work_items/601857.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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