CVE-2026-9308

Published: Jun 1, 2026Modified: Jul 22, 2026

5.4

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Exploitability: 2.8 / Impact: 2.5

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

Firefox for iOS Reader View replaced page content in its HTML template before replacing other internal placeholders. A malicious page could include a placeholder string that was later substituted with JSON-LD data, potentially resulting in arbitrary JavaScript execution. This vulnerability was fixed in Firefox for iOS 151.2.

Affected (1)

Products: Mozilla: Firefox

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Mozilla Firefox	Before 151.2

Related CWEs

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

References (2)

https://bugzilla.mozilla.org/show_bug.cgi?id=2039422

Source: security@mozilla.org

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2026-53/

Source: security@mozilla.org

Vendor Advisory

Timeline

No history available yet.