PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-3093 GitLab CVE debrief

CVE-2026-3093 is a vulnerability in GitLab CE/EE that allows an attacker to execute arbitrary JavaScript in another user's browser via a crafted URL. The issue exists in versions from 14.0 before 19.0.5, 19.1 before 19.1.3, and 19.2 before 19.2.1 due to improper sanitization of user-controlled input. This vulnerability has a CVSS score of 4.7 (MEDIUM). GitLab administrators and users, security teams, and IT professionals responsible for patching and vulnerability management should be aware of this issue and take necessary actions to protect their systems. The CVE record was published on 2026-07-29T20:17:03.137Z and has not been modified since then.

Vendor
GitLab
Product
Unknown
CVSS
MEDIUM 4.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-29
Original CVE updated
2026-08-03
Advisory published
2026-07-29
Advisory updated
2026-08-03

Who should care

GitLab administrators and users, security teams, and IT professionals responsible for patching and vulnerability management should be aware of this issue and take necessary actions to protect their systems. This includes reviewing the affected versions, applying patches, and monitoring for potential exploitation attempts. Additionally, security teams should consider implementing compensating controls, such as Web Application Firewalls (WAFs), to detect and prevent exploitation attempts.

Technical summary

CVE-2026-3093 is a vulnerability in GitLab CE/EE that allows an attacker to execute arbitrary JavaScript in another user's browser via a crafted URL. The issue exists in versions from 14.0 before 19.0.5, 19.1 before 19.1.3, and 19.2 before 19.2.1 due to improper sanitization of user-controlled input. The CVSS score for this vulnerability is 4.7 (MEDIUM). To mitigate this vulnerability, it is essential to patch vulnerable versions of GitLab CE/EE.

Defensive priority

GitLab users should prioritize patching vulnerable versions to prevent potential JavaScript execution in users' browsers.

Recommended defensive actions

  • Apply patches for GitLab CE/EE versions 19.0.5, 19.1.3, and 19.2.1 or later
  • Restrict access to vulnerable GitLab instances until patched
  • Monitor user browser interactions with GitLab for suspicious activity
  • Inventory GitLab instances to identify vulnerable versions
  • Implement compensating controls, such as Web Application Firewalls (WAFs), to detect and prevent exploitation attempts

Evidence notes

The CVE record indicates that GitLab CE/EE versions from 14.0 before 19.0.5, 19.1 before 19.1.3, and 19.2 before 19.2.1 are vulnerable to a JavaScript execution issue due to improper sanitization of user-controlled input. Limited information is available about the specific conditions required for exploitation. Defenders should verify the affected versions and configurations within their environments.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-3093 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-3093

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-3093 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-3093

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.