Cross-site scripting in Mozilla Bleach



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-6816
CWE-ID CWE-79
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Bleach
Universal components / Libraries / Libraries used by multiple products

Vendor Mozilla

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Cross-site scripting

EUVDB-ID: #VU26414

Risk: Low

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

CVE-ID: CVE-2020-6816

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

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

CPE2.3 External links

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


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.



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