CVE-2026-5173
HIGH 8.5 ALL-YEARSGitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9.6 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that could have allowed an authenticated user to invoke unintended server-side methods through websocket connections due to improper access control.
Severe if exploited (CVSS 8.5), but no confirmed exploitation. Patch on a normal cadence.
Exploitation likelihood
0.4%chance of exploitation in 30 days · 37th percentile
Impact if exploited
8.5CVSS 3.1 · HIGH · CNA
- ConfidentialityHigh
- IntegrityLow
- AvailabilityNone
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ⚠Privileges: Requires a low-privilege account
- ✓User interaction: No user interaction needed
- ✓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
Search GitHub now — results may be empty or unverified.
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.
Weakness (CWE)
- CWE-749: : Exposed Dangerous Method or Function
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
References and research data (JSON)
Unverified PoC candidates
Catalogue matches for further research. These repositories have not been validated as working exploits.
1 candidate
- https://github.com/0xBlackash/CVE-2026-5173
CVE-2026-5173
PoC-in-GitHub · CVE-2026-5173
PoC-in-GitHub · CVE-2026-5173 · Updated 2026-05-18T23:10:17Z
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Gitlab | Gitlab | ≥ 16.9.6 and < 18.8.9 |
| Gitlab | Gitlab | ≥ 18.9.0 and < 18.9.5 |
| Gitlab | Gitlab | ≥ 18.10.0 and < 18.10.3 |
| Gitlab | Gitlab | ≥ 16.9.6 and < 18.8.9 |
| Gitlab | Gitlab | ≥ 18.9.0 and < 18.9.5 |
| Gitlab | Gitlab | ≥ 18.10.0 and < 18.10.3 |
All CVSS metrics
- HIGH 8.5 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N - HIGH 8.5 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
References
Advisories
- https://about.gitlab.com/releases/2026/04/08/patch-release-gitlab-18-10-3-released/ CVE record · GitLab · Updated 2026-04-08T22:25:12.946Z
NVD · CVE-2026-5173 · Updated 2026-07-24T20:10:00.147 - https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-20802 EUVD · EUVD-2026-20802
Technical & other
- https://gitlab.com/gitlab-org/gitlab/-/work_items/588959 CVE record · GitLab · Updated 2026-04-08T22:25:12.946Z
NVD · CVE-2026-5173 · Updated 2026-07-24T20:10:00.147
Sources: NVD · CVE.org · All sources and attribution · EPSS