#VU56066 Cross-site scripting in Six Apart Ltd products - CVE-2021-20809
Published: August 25, 2021
Vulnerability identifier: #VU56066
Vulnerability risk: Low
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:Clear
CVE-ID: CVE-2021-20809
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Movable Type
Movable Type Advanced
Movable Type Premium
Movable Type Premium Advanced
Movable Type
Movable Type Advanced
Movable Type Premium
Movable Type Premium Advanced
Software vendor:
Six Apart Ltd
Six Apart Ltd
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 Create screens of Entry, Page, and Content Type. A remote 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.
Remediation
Install updates from vendor's website.