SB2026061534 - Universal XSS in Mozilla Focus for iOS

Description

This security bulletin contains information about 1 vulnerability.

1) Cross-site scripting (CVE-ID: CVE-2026-11799)

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

CVSSv4: 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:Green

The vulnerability allows a remote attacker to perform universal cross-site scripting.

The vulnerability exists due to improper neutralization of input during web page generation in WebKit navigation when visiting a specially crafted website or URL. A remote attacker can cause the browser to navigate to crafted content to perform universal cross-site scripting.

User interaction is required to visit a specially crafted website or open a specially crafted URL.

Remediation

Install update from vendor's website.

References

• https://www.mozilla.org/en-US/security/advisories/mfsa2026-55/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1975667