CVE-2026-53900
Last modified
CVE-2026-53900 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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.. EPSS estimates a 0.10% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox Mobile | < 152.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2043204Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-56/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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