Cross-site scripting in concrete5 - CVE-2021-3111
Published: March 18, 2021 / Updated: June 17, 2021
Vulnerability identifier: #VU51577
CSH Severity: Low
CVSS v4.0: 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/E:P/U:Clear
CVE-ID: CVE-2021-3111
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: PortlandLabs
Affected software:
concrete5
concrete5
Detailed vulnerability description
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 express entries in index.php/dashboard/express/entries/view/ URI. A remote user can 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.
How to mitigate CVE-2021-3111
Install update from vendor's website.
Sources
- http://packetstormsecurity.com/files/161600/Concrete5-8.5.4-Cross-Site-Scripting.html
- https://documentation.concrete5.org/developers/introduction/version-history
- https://documentation.concrete5.org/developers/introduction/version-history/855-release-notes
- https://github.com/Quadron-Research-Lab/CVE/blob/main/CVE-2021-3111.pdf