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
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires (1) a logged-in GitLab user as the victim and (2) that victim to interact with attacker-supplied content (UI:R) - typically clicking a crafted link or loading a malicious page within GitLab. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals point to a real but conditional risk rather than a mass-exploitation emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious GitLab URL or resource path that abuses the improper path validation, then lures a logged-in GitLab user (e.g., via a project link, comment, or external message) into opening it. When the victim's browser renders the page, attacker JavaScript executes within the victim's authenticated GitLab session, enabling session token theft, actions performed as the victim, or repository/account manipulation. … |
| Remediation | 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/. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all GitLab CE/EE instances and their versions (18.10-18.11.5, 19.0-19.0.2, 19.1.0 are affected). …
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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