CVE-2026-18252
HIGH 7.3 ALL-YEARSGitLab has remediated an issue in GitLab EE affecting all versions from 18.9 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1 that, under certain conditions, an authenticated user with developer-role permissions could have executed arbitrary commands in a CI context, due to the Claude agent processing configuration from a user-controlled source.
Severe if exploited (CVSS 7.3), but no confirmed exploitation. Patch on a normal cadence.
Exploitation likelihood
0.5%chance of exploitation in 30 days · 44th percentile
Impact if exploited
7.3CVSS 3.1 · HIGH · CNA
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityNone
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ⚠Privileges: Requires a low-privilege account
- ⚠User interaction: A user must take an action (click / open a file)
- ✓Complexity: No special conditions — reliably repeatable
✓ 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 weekly for the full archive, 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-829: : Inclusion of Functionality from Untrusted Control Sphere
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
References and research data (JSON)
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Gitlab | Gitlab | ≥ 18.9.0 and < 19.1.7 |
| Gitlab | Gitlab | ≥ 19.2.0 and < 19.2.5 |
| Gitlab | Gitlab | 19.3.0 |
All CVSS metrics
- HIGH 7.3 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N - HIGH 7.3 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N - HIGH 8.1 v3.1 · NVD Primary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
References
Exploit-tagged references (not proof of a PoC)
- https://hackerone.com/reports/3863650 CVE record · GitLab · Updated 2026-08-26T13:36:00.100Z
NVD · CVE-2026-18252 · Updated 2026-08-31T15:42:04.433
Advisories
- https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/ CVE record · GitLab · Updated 2026-08-26T13:36:00.100Z
NVD · CVE-2026-18252 · Updated 2026-08-31T15:42:04.433 - https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-66428 EUVD · EUVD-2026-66428
Technical & other
- https://gitlab.com/gitlab-org/gitlab/-/work_items/607342 CVE record · GitLab · Updated 2026-08-26T13:36:00.100Z
NVD · CVE-2026-18252 · Updated 2026-08-31T15:42:04.433
Sources: NVD · CVE.org · All sources and attribution · EPSS