TI-2025-34720 Aliases CVE-2025-55028 GHSA-h3xr-99q8-227g

JavaScript alerts could impede UI interaction or allow denial of service attacks

LOW 28CWE-400Published 2025-08-19 · Updated 2026-04-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-400.

Summary

Malicious scripts utilizing repetitive JavaScript alerts could prevent client user interaction in some scenarios and allow for denial of service attacks. This vulnerability was fixed in Firefox for iOS 142.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00222 12th percentileScored 2026-11-07

Fix Fixed Firefox for iOS (Mozilla): 142

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	—	142	Patch available	CNA

Firefox for iOS VendorMozilla Affected — Fixed in 142 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::iphone_os::*	before 142.0	Vulnerable	Mozilla

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:iphone_os:*:* Versions before 142.0 Vulnerable ·Mozilla

Remediation

Fix · CNA Firefox for iOS (Mozilla) Fixed in 142

Timeline

2026-10-02 Threatist record created from CVE-2025-55028
2026-10-03 Alias added: GHSA-h3xr-99q8-227g

References

Advisory 1

https://www.mozilla.org/security/advisories/mfsa2025-68/

Other 1

https://bugzilla.mozilla.org/show_bug.cgi?id=1850240

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