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.

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Fixes

Solution

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Workaround

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History

Mon, 01 Jun 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox For Ios
Vendors & Products Mozilla
Mozilla firefox For Ios

Mon, 01 Jun 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-79
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 01 Jun 2026 13:00:00 +0000

Type Values Removed Values Added
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.
Title Arbitrary JavaScript execution in Reader View due to wrong HTML replacement order
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-06-01T13:52:59.059Z

Reserved: 2026-05-22T18:16:25.742Z

Link: CVE-2026-9308

cve-icon Vulnrichment

Updated: 2026-06-01T13:52:02.702Z

cve-icon NVD

Status : Received

Published: 2026-06-01T13:16:33.523

Modified: 2026-06-01T15:16:39.447

Link: CVE-2026-9308

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-01T16:30:06Z

Weaknesses