CVE-2026-1090 json
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
published 2026-03-11 7 mo ago modified 2026-09-10 59 d ago also BIT-gitlab-2026-1090 , EUVD-2026-11180
- cvss
- 8.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 20%
- public exploits
- 0
- none known
Summary
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 10.6 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user, when the `markdown_placeholders` feature flag was enabled, to inject JavaScript in a browser due to improper sanitization of placeholder content in markdown processing.
Patch / fix
- bitnami gitlab 18.7.6, 18.8.6, 18.9.2
- GitLab GitLab 18.7.6, 18.8.6, 18.9.2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- hackerone.com https://hackerone.com/reports/3502450 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| OSV | 3.1 | 8.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | gitlab | >=10.6.0, <18.7.6 >=18.8.0, <18.8.6 >=18.9.0, <18.9.2 |
18.7.6 18.8.6 18.9.2 |
Affected products
- GitLab GitLab
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
-
hackerone.com
/reports/3502450
technical-description, exploit, permissions-required, web
-
about.gitlab.com
/releases/2026/03/11/patch-release-gitlab-18-9-2-released/
release-notes, vendor-advisory, advisory
-
gitlab.com
/gitlab-org/gitlab/-/work_items/586478
broken-link, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-1090
web
Sources
- CVE List CVE-2026-1090
- NVD CVE-2026-1090
- OSV BIT-gitlab-2026-1090
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.