TI-2026-38876 Aliases CVE-2026-53900 GHSA-6xv8-mg86-mq56

Cookie injection was possible when opening a PDF link

LOW 19CWE-345Published 2026-06-16 · Updated 2026-06-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Security bypass, Spoofing
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-345 and CWE-384.

Summary

Firefox for iOS preserved cookies set on the initial PDF request across cross-origin HTTP redirects in TemporaryDocument, allowing a malicious site to inject arbitrary cookies into requests to an unrelated target domain. This vulnerability was fixed in Firefox for iOS 152.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.001 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: 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	—	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-2026-53900
2026-10-03 Alias added: GHSA-6xv8-mg86-mq56

References

Advisory 1

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

Other 1

https://bugzilla.mozilla.org/show_bug.cgi?id=2043204

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