TI-2026-08175 Aliases CVE-2026-9309 GHSA-29fm-4hpp-5p7g

Arbitrary JavaScript execution in internal pages via Reader View JSON-LD injection

LOW 24CWE-79Published 2026-06-01 · Updated 2026-06-01

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

Firefox for iOS Reader View did not properly escape HTML tags in JSON-LD metadata. A malicious page could inject markup that changed Reader View behavior and leaked sensitive URL parameters. These parameters could then be used to access internal pages, potentially resulting in arbitrary JavaScript execution in an internal origin. This vulnerability was fixed in Firefox for iOS 151.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00157 4th percentileScored 2026-11-07

Fix Fixed Firefox for iOS (Mozilla): 151.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Mozilla	Firefox for iOS	—	151.2	Patch available	CNA

Firefox for iOS VendorMozilla Affected — Fixed in 151.2 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::iphone_os::*	before 151.2	Vulnerable	Mozilla

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:iphone_os:*:* Versions before 151.2 Vulnerable ·Mozilla

Remediation

Fix · CNA Firefox for iOS (Mozilla) Fixed in 151.2

Timeline

2026-10-02 Threatist record created from CVE-2026-9309
2026-10-03 Alias added: GHSA-29fm-4hpp-5p7g

References

Advisory 1

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

Other 1

https://bugzilla.mozilla.org/show_bug.cgi?id=2036573

TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8

See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences