#VU48462 Universal cross-site scripting in Mozilla Firefox and Firefox ESR - CVE-2020-26956
Published: November 17, 2020
Vulnerability identifier: #VU48462
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2020-26956
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Mozilla Firefox
Firefox ESR
Mozilla Firefox
Firefox ESR
Software vendor:
Mozilla
Mozilla
Description
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 some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS.
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.
Remediation
Install updates from vendor's website.