TI-2025-09948 Aliases CVE-2025-10859 GHSA-q64v-9mh2-3xcq

Data stored in cookies for non-HTML content while browsing Incognito could be viewed after closing private tabs

LOW 18CWE-359Published 2025-09-30 · Updated 2026-04-13

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: Low · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-359.

Summary

Cookie storage for non-HTML temporary documents was being shared incorrectly with normal browsing content, allowing information from private tabs to escape Incognito mode even after the user closed all tabs. This vulnerability was fixed in Firefox for iOS 143.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0012 1st percentileScored 2026-11-07

Fix Fixed Firefox for iOS (Mozilla): 143.1

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	—	143.1	Patch available	CNA

Firefox for iOS VendorMozilla Affected — Fixed in 143.1 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::iphone_os::*	before 143.1.0	Vulnerable	Mozilla

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:iphone_os:*:* Versions before 143.1.0 Vulnerable ·Mozilla

Remediation

Fix · CNA Firefox for iOS (Mozilla) Fixed in 143.1

Timeline

2026-10-02 Threatist record created from CVE-2025-10859
2026-10-03 Alias added: GHSA-q64v-9mh2-3xcq

References

Advisory 1

https://www.mozilla.org/security/advisories/mfsa2025-79/

Other 1

https://bugzilla.mozilla.org/show_bug.cgi?id=1684624

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