CVE-2026-84739Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
Updated under an hour ago ()
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It affects GitLab. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.47%, higher than 39% of scored CVEs.
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GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.11 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 that under certain conditions could have allowed an authenticated user to execute arbitrary JavaScript in the context of another user's browser session due to improper sanitization of path components in the merge request diff viewer.
- CVSS
- 8.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- Weakness (CWE)
- CWE-79
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.47% (percentile 39)
- Assigned by
- GitLab
- NVD analysis
- Analyzed
- Record last updated
- Sep 29, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
GitLab GitLab gitlab:gitlab | from 13.11 before 19.2.7; from 19.3 before 19.3.3; from 19.4 before 19.4.1 | CNA record |
gitlab gitlab gitlab:gitlab | from 13.11.0 before 19.2.7; from 13.11.0 before 19.2.7; from 19.3.0 before 19.3.3; from 19.3.0 before 19.3.3; 19.4.0; 19.4.0 | NVD |
References
- https://gitlab.com/gitlab-org/gitlab/-/work_items/627316broken-link
- https://hackerone.com/reports/3938482technical-description, exploit, permissions-required
- https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-1-released/release-notes, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.