EUVD-2026-42402
GHSA-m49f-rvv4-r4rv
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Network-reachable authenticated XSS needing only a content-creation privilege (PR:L, not H), specific conditions (AC:H) and victim viewing (UI:R); executes in another user's context (S:C) with high C/I impact, no availability effect.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
4DescriptionNVD
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.7 before 18.11.7, 19.0 before 19.0.4, and 19.1 before 19.1.2 that under certain conditions could have allowed an authenticated user to execute arbitrary scripts in another user's browser session due to improper sanitization of user-supplied input.
AnalysisAI
Stored/reflected cross-site scripting in GitLab CE/EE (all versions from 15.7 before 18.11.7, 19.0 before 19.0.4, and 19.1 before 19.1.2) lets an authenticated user inject unsanitized input that executes arbitrary JavaScript in a victim's browser session, enabling session hijacking or actions on the victim's behalf. The scope-changed CVSS 7.3 reflects that the payload crosses a security boundary into another user's context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated GitLab account with the privileges needed to submit the vulnerable user-supplied input (CVSS PR:H), and it only triggers 'under certain conditions' per the vendor, consistent with the high attack complexity (AC:H) - meaning a specific field, feature, or state must be in play rather than any arbitrary input. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N, base 7.3 High) presents a mixed risk profile: network-reachable and scope-changing with high confidentiality/integrity impact, but materially constrained by high attack complexity (AC:H), high privileges required (PR:H), and required user interaction (UI:R). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated GitLab user with sufficient privileges crafts input containing a malicious script and stores it in a field that another user will render (for example a work item, comment, or project field). When a targeted victim views that content, the script executes in their browser session, letting the attacker steal session tokens or perform authenticated actions as the victim. … |
| Remediation | Vendor-released patch: upgrade to GitLab CE/EE 18.11.7, 19.0.4, or 19.1.2 (whichever is on your release branch), per the GitLab patch release advisory (https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-1-2-released/); self-managed operators should apply the patch release immediately and GitLab.com is already remediated. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all GitLab CE/EE instances and confirm affected versions (15.7 before 18.11.7, 19.0 before 19.0.4, 19.1 before 19.1.2). …
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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