CVE-2026-15723
HIGH 8.2GitLab has remediated an issue in GitLab CE/EE affecting all versions from 10.1 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, when OmniAuth SAML and LDAP auto-linking were both enabled, an authenticated user could have taken over an existing LDAP-backed account without any interaction from the targeted user, due to improper input sanitization in the LDAP email lookup path used during OmniAuth identity linking.
Severe if exploited (CVSS 8.2), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.4%chance of exploitation in 30 days · 36th percentile
Impact if exploited
8.2CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityHigh
- 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: Needs a race window or specific setup
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-90: : Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
References and research data (JSON)
All CVSS metrics
- HIGH 8.2 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N - HIGH 8.2 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
References
Exploit-tagged references (not proof of a PoC)
- https://hackerone.com/reports/3852192 CVE record · GitLab · Updated 2026-10-21T23:35:15.434Z
NVD · CVE-2026-15723 · Updated 2026-10-23T12:18:13.843
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-107677 EUVD · EUVD-2026-107677
Technical & other
- https://gitlab.com/gitlab-org/gitlab/-/work_items/605977CVE record · GitLab · Updated 2026-10-21T23:35:15.434Z
NVD · CVE-2026-15723 · Updated 2026-10-23T12:18:13.843 - https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/CVE record · GitLab · Updated 2026-10-21T23:35:15.434Z
NVD · CVE-2026-15723 · Updated 2026-10-23T12:18:13.843