XSS in GitLab
CVE-2021-39885
A Stored XSS in merge request creation page in all versions of Gitlab EE starting from 13.7 before 14.1.7, all versions starting from 14.2 before 14.2.5, and all versions starting from 14.3 before 14.3.1 allows an attacker to execute arbitrary JavaScript code on the victim's behalf via malicious approval rule names
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.010 (60.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- GitLab — versions >=13.7, <14.1.7, >=14.3, <14.3.1, >=14.2, <14.2.5
Weakness classification (CWE)
References
- gitlab.com/gitlab-org/gitlab/-/issues/341140 (Exploit, Issue Tracking, Vendor Advisory)
- hackerone.com/reports/1342009 (Permissions Required, Exploit, Third Party Advisory)
- gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39885.json (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-39885?
- CVE-2021-39885 is a high-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2021-10-04.
- How severe is CVE-2021-39885?
- High severity. CVSS v3 base score is 8.7 out of 10.