CVE-2026-9308
Arbitrary JavaScript execution in Reader View due to wrong HTML replacement order
- State
- Published
- Severity
- 5.4 Medium
- Published
- Jun 1, 2026
- Updated
- Jun 1, 2026
- Reserved
- May 22, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.4 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N | CISA-ADP |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
Firefox for iOSMozilla |
|
References
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