CVE-2026-87719
CRITICAL 9.9GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 18.11.12, 19.0 before 19.0.9, 19.1 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup.
Severe if exploited (CVSS 9.9), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.6%chance of exploitation in 30 days · 47th percentile
Impact if exploited
9.9CVSS 3.1 · CRITICAL
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
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 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-502: : Deserialization of Untrusted Data
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References and research data (JSON)
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Gitlab | Gitlab | ≥ 18.3.0 and < 18.11.12 |
| Gitlab | Gitlab | ≥ 19.0.0 and < 19.0.9 |
| Gitlab | Gitlab | ≥ 19.1.0 and < 19.1.8 |
| Gitlab | Gitlab | ≥ 19.2.0 and < 19.2.6 |
| Gitlab | Gitlab | ≥ 19.3.0 and < 19.3.2 |
All CVSS metrics
- CRITICAL 9.9 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - CRITICAL 9.9 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References
Exploit-tagged references (not proof of a PoC)
- https://hackerone.com/reports/4012289 CVE record · GitLab · Updated 2026-09-23T21:05:05.577Z
NVD · CVE-2026-87719 · Updated 2026-09-28T19:08:29.813
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-76778 EUVD · EUVD-2026-76778
Technical & other
- https://gitlab.com/gitlab-org/gitlab/-/work_items/628160 CVE record · GitLab · Updated 2026-09-23T21:05:05.577Z
NVD · CVE-2026-87719 · Updated 2026-09-28T19:08:29.813