CVE-2026-53900

Cookie injection was possible when opening a PDF link

Published: Jun 16, 2026Updated: Jun 17, 2026 Sources: CVE List NVDCWE-345

NVD MITRE

4.3CVSSMEDIUM

Description

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.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:UScope

Unchanged

Impact

C:LConfidentiality

Low

I:NIntegrity

None

A:NAvailability

None

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Weaknesses

CWE-345 CWE-384

Affected Products

Firefox for iOS Mozilla Consumer Software

firefox mobile mozilla Consumer Software

mozillaoss-projectUSConsumer Softwareaka mozilla corp.

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

3 techniques

Collection

Defense Evasion

Initial Access

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References

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

bugzilla.mozilla.org

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

mozilla.org

Timeline

Published

Jun 16, 2026

Last Updated

Jun 17, 2026

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