CVE-2026-53899
Cross-origin cookies could be leaked when opening a PDF link
Vexday Risk Score
13Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 6.5EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
16 Jun 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
Firefox for iOS used partial domain matching when attaching cookies to PDF requests, allowing a malicious site on a suffix domain to receive cookies belonging to the target site. This vulnerability was fixed in Firefox for iOS 152.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Affected products
Mozilla · Firefox for iOSWant to know if your infrastructure is exposed to this?
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