CVE-2026-53900

Public on 2026-06-16
Modified on 2026-06-20
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.
Severity
Medium severity
Medium
See what this means
CVSS v3 Base Score
4.3
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 2 - Firefox Extra firefox Not Affected
Amazon Linux 2023 firefox Not Affected
Amazon Linux 2 - Firefox Extra firefox-amzn-policies-generic Not Affected

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-53900 Mitre: CVE-2026-53900