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VulnerabilityCVE-2026-15723Published 2026-10-21

CVE-2026-15723 — GitLab

high

As of 2026-10-21, CVE-2026-15723 is a HIGH-severity vulnerability in GitLab, CVSS v3.1 8.2. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-15723, most recently “Critical GitLab Flaw CVE-2026-110264 (CVSS 10.0): Unauthenticated RCE via Onigmo Regex Integer Overflow Across GitLab 7.0-19.5”.

CVSS v3.1
8.2/10High
EPSS
—No EPSS score yet
CISA KEV
NoNot in the KEV catalog
Tracked threats
1Campaigns referencing it
Priority
4.1/10Threadlinqs triage score
Published
CVSS v3.1 8.2 (HIGH) · Priority 4.1/10 · Published 2026-10-21

Last updated:

What is CVE-2026-15723?

GitLab 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.

The record classifies CVE-2026-15723 under weakness class CWE-90. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 1 day ago.

Severity and exploitation probability

CVSS v3.1 base score
8.2 — HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
4.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-10-21

Is CVE-2026-15723 being exploited?

No public exploitation evidence for CVE-2026-15723 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-10-21. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

Affected products and versions

How to fix CVE-2026-15723

No vendor patch reference has been recorded for CVE-2026-15723 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-15723

1 tracked threat in the Threadlinqs corpus references CVE-2026-15723, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org. Last verified by Threadlinqs on .

Exploit and proof of concept

Other references