Vulnerability identifier: #VU26414

Vulnerability risk: Low

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-2020-6816

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Bleach
Universal components / Libraries / Libraries used by multiple products

Vendor: Mozilla

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 when processing embedded MathML and SVG content with RCDATA tags. A remote attacker can 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

Bleach: 3.1.0 - 3.1.1

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External links
http://github.com/mozilla/bleach/releases/tag/v3.1.2
http://bugzilla.mozilla.org/show_bug.cgi?id=1621692

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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.