What’s Vulnerable › Vulnerabilities

CVE-2026-8589: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

• Severity: high (CVSS 8.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-11 · updated 2026-06-17
• Weakness: CWE-79

Description

GitLab has remediated an issue in GitLab EE affecting all versions from 13.1.4 before 18.10.8, 18.11 before 18.11.5, and 19.0 before 19.0.2 that under certain conditions could have allowed an authenticated user to add unauthorized email addresses to a targeted user's account due to improper sanitization of user-supplied input in certain group setting fields.

Affected products

• GitLab: from 13.1.4 before 18.10.8; from 18.11.0 before 18.11.5; from 19.0.0 before 19.0.2 — fixed in 18.10.8, 18.11.5, 19.0.2

How to fix

Upgrade to a fixed version: GitLab 18.10.8, 18.11.5, 19.0.2. Check the vendor advisory for mitigations.

References

• https://about.gitlab.com/releases/2026/06/10/patch-release-gitlab-19-0-2-released/
• https://gitlab.com/gitlab-org/gitlab/-/work_items/600099
• https://hackerone.com/reports/3722842

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