Cross-site scripting in GitLab Enterprise Edition and Gitlab Community Edition - CVE-2021-39878
Published: October 4, 2021
Vulnerability identifier: #VU57017
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2021-39878
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in the Jira integration. A remote authenticated attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Affected software
GitLab Enterprise Edition
Gitlab Community Edition
Gitlab Community Edition
How to mitigate CVE-2021-39878
Install updates from vendor's website.
GitLab Enterprise Edition - addressed in versions 14.1.7, 14.2.5, 14.3.1
Gitlab Community Edition - addressed in versions 14.1.7, 14.2.5, 14.3.1
Gitlab Community Edition - addressed in versions 14.1.7, 14.2.5, 14.3.1