CVE-2026-78252

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

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.

Affected

GitLab

CVSS v3.1 NVD

6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 GITLAB

8.2 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L

EPSS

0.27% chance of exploitation in the next 30 days, 18th percentile

Published

2026-09-16

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3917471

Security advisories

• https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-2-released
• https://gitlab.com/gitlab-org/gitlab/-/work_items/621447

References

• CVE Record
• NVD entry