Stored cross-site scripting in MediaWiki - CVE-2021-41798
Published: October 1, 2021
Vulnerability identifier: #VU56980
CSH Severity: Medium
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-2021-41798
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The disclosed vulnerability allows a remote user to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in Special:Search. A remote user can permanently inject 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
MediaWiki
mediawiki (Debian package)
mediawiki
Fedora
mediawiki (Debian package)
mediawiki
Fedora
How to mitigate CVE-2021-41798
Install updates from vendor's website.
MediaWiki - addressed in versions 1.31.16, 1.35.4, 1.36.2
mediawiki (Debian package) - addressed in versions 1:1.31.16-1~deb10u1, 1:1.35.4-1~deb11u1
mediawiki - addressed in versions 1.35.4-1.fc33, 1.35.4-1.fc34, 1.36.2-1.fc35
mediawiki (Debian package) - addressed in versions 1:1.31.16-1~deb10u1, 1:1.35.4-1~deb11u1
mediawiki - addressed in versions 1.35.4-1.fc33, 1.35.4-1.fc34, 1.36.2-1.fc35