Vulnerability identifier: #VU24713

Vulnerability risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8420

CWE-ID: CWE-352

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Joomla!
Web applications / CMS

Vendor: Joomla!

Description

The vulnerability allows a remote attacker to perform cross-site request forgery attacks.

The vulnerability exists due to insufficient validation of the HTTP request origin in com_templates LESS compiler. A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Joomla!: 3.9.0 - 3.9.14, 3.8.0 - 3.8.13, 3.7.0 - 3.7.5, 3.6.0 - 3.6.5, 3.5.0 - 3.5.9, 3.4.0 - 3.4.8, 3.3.0 - 3.3.6, 3.2.0 - 3.2.7, 3.1.0 - 3.1.6, 3.0.0 - 3.0.4

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External links
http://developer.joomla.org/security-centre/799-20200102-core-csrf-com-templates-less-compiler.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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