# CVE-2026-15723 — GitLab

> 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”.

**Last updated:** 2026-10-21

## 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](https://cwe.mitre.org/data/definitions/90.html). 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

- [GitLab](https://intel.threadlinqs.com/vendors/gitlab): GitLab

## 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.

- [Critical GitLab Flaw CVE-2026-110264 (CVSS 10.0): Unauthenticated RCE via Onigmo Regex Integer Overflow Across GitLab 7.0-19.5](https://intel.threadlinqs.com/threat/TL-2026-4063) — CRITICAL · 2026-10-21

## Sources

Enriched from CVE.org. Last verified by Threadlinqs on 2026-10-22.

**Exploit and proof of concept**

- [hackerone.com — technical description](https://hackerone.com/reports/3852192)

**Other references**

- [gitlab.com](https://gitlab.com/gitlab-org/gitlab/-/work_items/605977)
- [docs.gitlab.com](https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-15723
Full detection coverage and IOCs for threats exploiting CVE-2026-15723 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp