#VU46663 Cross-site scripting in baserCMS - CVE-2020-15155

Vulnerability identifier: #VU46663

Vulnerability risk: Low

CVSSv4.0: 1.2 [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:U/U:Clear]

CVE-ID: CVE-2020-15155

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
baserCMS
Web applications / CMS

Vendor: baserproject

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 "toolbar.php". A remote authenticated 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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

baserCMS: 1.6.11 - 4.3.6

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External links
https://basercms.net/security/20200827
https://github.com/baserproject/basercms/commit/94cbfab74c9fd6d04492597a1a684674c3c0e30f
https://github.com/baserproject/basercms/security/advisories/GHSA-4r3m-j6x5-48m3

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.