CVE-2026-78252CWE-79cross-site-scripting

CVE-2026-78252

High · published September 16, 2026

CVSS v3.1
8.2
EPSS
0%
Percentile
18.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00270 · 18.2th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-16T11:16Z
Affected products (6)
ProductVersionsFixed in
gitlab/gitlab≥ 15.3.0, < 19.1.819.1.8
gitlab/gitlab≥ 15.3.0, < 19.1.819.1.8
gitlab/gitlab≥ 19.2.0, < 19.2.619.2.6
gitlab/gitlab≥ 19.2.0, < 19.2.619.2.6
gitlab/gitlab≥ 19.3.0, < 19.3.219.3.2
gitlab/gitlab≥ 19.3.0, < 19.3.219.3.2
References (3)
https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-2-released/ · [email protected]https://gitlab.com/gitlab-org/gitlab/-/work_items/621447 · [email protected]https://hackerone.com/reports/3917471 · [email protected]
EPSS history
Timeline
  • 17 SEP 03:32Z
    EPSS moved — → 0%
    epss
  • 16 SEP 06:33Z
    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
    cvelistv5