Medium severity · published Sep 16, 2026
CVE-2026-78252
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
6.1
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GI
GitLab · GitLab
15.3 before 19.1.8; 19.2 before 19.2.6; 19.3 before 19.3.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-78252
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-78252
Release Notes
https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-2-released/
Issue Tracking
https://gitlab.com/gitlab-org/gitlab/-/work_items/621447
Permissions Required
https://hackerone.com/reports/3917471
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