Cross-site scripting in Roundcube Webmail - CVE-2021-26925
Published: February 9, 2021 / Updated: February 12, 2021
Vulnerability identifier: #VU50432
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2021-26925
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 CSS content passed via HTML messages. A remote attacker can send a specially crafted email message to the victim and execute arbitrary HTML and script code in user's browser in context of vulnerable website, once the malicious email is opened.
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
Roundcube Webmail
Arch Linux
Fedora
roundcubemail
Arch Linux
Fedora
roundcubemail
How to mitigate CVE-2021-26925
Install updates from vendor's website.
Roundcube Webmail - update to 1.4.11
roundcubemail - addressed in versions 1.4.11-1.fc32, 1.4.11-1.fc33
roundcubemail - addressed in versions 1.4.11-1.fc32, 1.4.11-1.fc33