CVE-2026-78252
HIGH 8.2GitLab 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.
Severe if exploited (CVSS 8.2), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.3%chance of exploitation in 30 days · 19th percentile
Impact if exploited
8.2CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityLow
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ⚠User interaction: A user must take an action (click / open a file)
- ⚠Complexity: Needs a race window or specific setup
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
Search for new PoCs
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Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.
Data snapshot:
Weakness (CWE)
- CWE-79: : Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L
References and research data (JSON)
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Gitlab | Gitlab | ≥ 15.3.0 and < 19.1.8 |
| Gitlab | Gitlab | ≥ 15.3.0 and < 19.1.8 |
| Gitlab | Gitlab | ≥ 19.2.0 and < 19.2.6 |
| Gitlab | Gitlab | ≥ 19.2.0 and < 19.2.6 |
| Gitlab | Gitlab | ≥ 19.3.0 and < 19.3.2 |
| Gitlab | Gitlab | ≥ 19.3.0 and < 19.3.2 |
All CVSS metrics
- HIGH 8.2 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L - HIGH 8.2 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L - MEDIUM 6.1 v3.1 · NVD Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
Exploit-tagged references (not proof of a PoC)
- https://hackerone.com/reports/3917471 CVE record · GitLab · Updated 2026-09-16T06:33:30.825Z
NVD · CVE-2026-78252 · Updated 2026-09-28T13:26:58.440
Advisories
- https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-2-released/ CVE record · GitLab · Updated 2026-09-16T06:33:30.825Z
NVD · CVE-2026-78252 · Updated 2026-09-28T13:26:58.440 - https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-80222 EUVD · EUVD-2026-80222
Technical & other
- https://gitlab.com/gitlab-org/gitlab/-/work_items/621447 CVE record · GitLab · Updated 2026-09-16T06:33:30.825Z
NVD · CVE-2026-78252 · Updated 2026-09-28T13:26:58.440