Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
Published Feb 25, 2026
8.0
HIGHCVSS 3.1
EPSS 0.31%
Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that under certain circumstances, could have allowed an unauthenticated user to inject arbitrary scripts into the Mermaid sandbox UI.
Affected products
-
- Version 16.2StatusaffectedConstraints<18.7.5
- Version 18.8StatusaffectedConstraints<18.8.5
- Version 18.9StatusaffectedConstraints<18.9.1
- Version
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
Upgrade to versions 18.7.5, 18.8.5, 18.9.1 or above.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
1 other source (CVE.org) ▾
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Feb 26, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Feb–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.31% (0.00314) | 22.14th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.31% (0.00309) | 22.31th | v5 (v2026.06.15) |
| Feb 26, 2026 | 0.04% (0.00044) | 13.48th | v4 (v2025.03.14) |
References (3)
- https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/ Release NotesVendor Advisory
- https://gitlab.com/gitlab-org/gitlab/-/issues/585371 issue-trackingpermissions-requiredBroken Link
- https://hackerone.com/reports/3473276 technical-descriptionexploitpermissions-requiredPermissions Required
| Link | Providers | Tags |
|---|---|---|
| https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/ | Release NotesVendor Advisory | |
| https://gitlab.com/gitlab-org/gitlab/-/issues/585371 | issue-trackingpermissions-requiredBroken Link | |
| https://hackerone.com/reports/3473276 | technical-descriptionexploitpermissions-requiredPermissions Required |
Change history (0)
No recorded changes yet.