#VU52900 Universal cross-site scripting in Firefox for Android - CVE-2021-29953

Vulnerability identifier: #VU52900

Vulnerability risk: High

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:Amber]

CVE-ID: CVE-2021-29953

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Firefox for Android
Mobile applications / Apps for mobile phones

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. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary JavaScript in the context of another domain.

Successful exploitation of this vulnerability may allow a remote attacker to compromise the affected system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Firefox for Android: 80.1.2 - 88.1.2

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2021-20/

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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.