CVE-2026-53900

MEDIUM

Cookie injection was possible when opening a PDF link

Title source: cna

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.

References (2)

Core 2

Core References

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

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

Scores

CVSS v3 4.3

EPSS 0.0010

EPSS Percentile 1.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-345 CWE-384

Status published

Products (2)

Mozilla/Firefox for iOS 152.0

mozilla/firefox_mobile < 152.0

Published Jun 16, 2026

Tracked Since Jun 16, 2026