CVE-2026-78252 json
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
published 2026-09-16 53 d ago modified 2026-09-29 40 d ago also BIT-gitlab-2026-78252 , EUVD-2026-80222
- cvss
- 8.2
- 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 19%
- public exploits
- 0
- none known
Summary
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.3 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that, under certain conditions, an authenticated user could have induced a targeted user to perform unintended state-changing HTTP requests due to improper sanitization of user-controlled data in the Markdown JSON table renderer.
Patch / fix
- bitnami gitlab 19.1.8, 19.2.6, 19.3.2
- GitLab GitLab 19.1.8, 19.2.6, 19.3.2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 53 d ago
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- hackerone.com https://hackerone.com/reports/3917471 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| OSV | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | gitlab | >=15.3.0, <19.1.8 >=19.2.0, <19.2.6 >=19.3.0, <19.3.2 |
19.1.8 19.2.6 19.3.2 |
Affected products
- GitLab GitLab
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
-
hackerone.com
/reports/3917471
technical-description, exploit, permissions-required, web
-
docs.gitlab.com
/releases/patches/patch-release-gitlab-19-3-2-released/
release-notes, vendor-advisory, advisory
-
gitlab.com
/gitlab-org/gitlab/-/work_items/621447
issue-tracking, report
-
nvd.nist.gov
/vuln/detail/CVE-2026-78252
web
Sources
- CVE List CVE-2026-78252
- NVD CVE-2026-78252
- OSV BIT-gitlab-2026-78252
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.