TI-2026-38875 Aliases CVE-2026-53899 GHSA-848m-8qg2-wmrv

Cross-origin cookies could be leaked when opening a PDF link

LOW 33CWE-345Published 2026-06-16 · Updated 2026-06-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
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-345.

Summary

Firefox for iOS used partial domain matching when attaching cookies to PDF requests, allowing a malicious site on a suffix domain to receive cookies belonging to the target site. This vulnerability was fixed in Firefox for iOS 152.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00096 0th percentileScored 2026-11-07

Fix Fixed Firefox for iOS (Mozilla): 152.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
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	—	152.0	Patch available	CNA

Firefox for iOS VendorMozilla Affected — Fixed in 152.0 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox_mobile::::::iphone_os::*	before 152.0	Vulnerable	Mozilla

cpe:2.3:a:mozilla:firefox_mobile:*:*:*:*:*:iphone_os:*:* Versions before 152.0 Vulnerable ·Mozilla

Remediation

Fix · CNA Firefox for iOS (Mozilla) Fixed in 152.0

Timeline

2026-10-02 Threatist record created from CVE-2026-53899
2026-10-03 Alias added: GHSA-848m-8qg2-wmrv

References

Advisory 1

https://www.mozilla.org/security/advisories/mfsa2026-56/

Other 1

https://bugzilla.mozilla.org/show_bug.cgi?id=2042909

TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
TI-2022-09831 Use after free in Mozilla Firefox KEVCVSS 3.1HIGH 8.8
TI-2023-13905 Race condition in Mozilla Firefox for Android CVSS 3.1HIGH 7.5
TI-2023-13916 A wrong lowering instruction in the ARM64 Ion compiler resulted in a wrong optimization… CVSS 3.1MEDIUM 6.5
TI-2023-13903 Following a Garbage Collector compaction, weak maps may have been accessed before they… CVSS 3.1MEDIUM 6.5
TI-2022-13642 Information disclosure in Mozilla Firefox for iOS CVSS 3.1MEDIUM 6.5

See all 86 →

Sources

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