#VU51535 Cross-site scripting in MyBB - CVE-2021-27889

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Main Vulnerability Database Vulnerabilities #VU51535

#VU51535 Cross-site scripting in MyBB - CVE-2021-27889

Published: March 17, 2021 / Updated: April 7, 2022


Vulnerability identifier: #VU51535
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:P/U:Clear
CVE-ID: CVE-2021-27889
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability: Public exploit is available
Vulnerable software:
MyBB
Software vendor:
MyBB Group

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 within the Nested Auto URL when parsing messages. 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 update from vendor's website.

External links