High severity7.3NVD Advisory· Published Oct 5, 2021· Updated Jun 17, 2026
CVE-2021-39887
CVE-2021-39887
Description
A stored Cross-Site Scripting vulnerability in the GitLab Flavored Markdown in GitLab CE/EE version 8.4 and above allowed an attacker to execute arbitrary JavaScript code on the victim's behalf.
Affected products
4- Range: >=8.4
>=8.4+ 1 more
- (no CPE)range: >=8.4
- (no CPE)range: >=8.4, <14.1.7
Patches
Vulnerability mechanics
References
3- gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39887.jsonnvdVendor Advisory
- hackerone.com/reports/1218174nvdPermissions RequiredThird Party Advisory
- gitlab.com/gitlab-org/gitlab/-/issues/332903nvdBroken Link
News mentions
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