Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-78252

CVE-2026-78252MEDIUM

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

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  C  L  L  N    6.1   .0027   17.4     —

AFFECTED
  Product  Versions  Fixed
  GitLab   15.3 –    —

TIMELINE
  Aug 24  Reserved by GitLab
  Sep 16  Published (CNA: GitLab)
  Sep 28  RESCORED — CVE-2026-78252 (GitLab). CVSS 8.2 → 6.1 (NVD).

CWE-79 · CNA: GitLab · CVSS v3.1 · 3 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 24, 2026	Reserved	Reserved by GitLab
September 16, 2026	Published	Published (CNA: GitLab)
September 28, 2026	RESCORED	RESCORED — CVE-2026-78252 (GitLab). CVSS 8.2 → 6.1 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
GitLab	GitLab	—	15.3	—

Weaknesses

CWE-79

References (3)

https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-2-released/ [Release Notes, Vendor Advisory]
https://gitlab.com/gitlab-org/gitlab/-/work_items/621447 [Issue Tracking]
https://hackerone.com/reports/3917471 [Permissions Required]

Authoritative record: CVE-2026-78252 at cve.org

Vendors: gitlab

Weaknesses: CWE-79

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-78252 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.