CVE-2025-11716: Sandboxed iframes allowed links to open in external apps (Android only)

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-14 · updated 2026-10-18
Weakness: CWE-284

Description

Links in a sandboxed iframe could open an external app on Android without the required "allow-" permission. This vulnerability was fixed in Firefox 144 and Thunderbird 144.

Affected products

Mozilla Firefox: before 144.0 — fixed in 144.0
Mozilla Thunderbird: before 144.0 — fixed in 144.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 144.0; Mozilla Thunderbird 144.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1818679
https://www.mozilla.org/security/advisories/mfsa2025-81/
https://www.mozilla.org/security/advisories/mfsa2025-84/

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