CVE-2026-8589

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

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

GitLab

CVSS v3.1 NVD

8.7 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS v3.1 GITLAB

7.3 HIGHCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N

EPSS

0.40% chance of exploitation in the next 30 days, 33rd percentile

Published

2026-06-11

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3722842

Security advisories

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

References

• CVE Record
• NVD entry