TI-2026-08174 Aliases CVE-2026-9308 GHSA-h55j-6jm9-f8vp

Arbitrary JavaScript execution in Reader View due to wrong HTML replacement order

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 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.

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-2026-9308
2026-10-03 Alias added: GHSA-h55j-6jm9-f8vp

References

Advisory 1

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

Other 1

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

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