CVE-2025-10859 — Data stored in cookies for non-HTML content while browsing Incognito could be viewed after closing private tabs

CVE-2025-10859

Data stored in cookies for non-HTML content while browsing Incognito could be viewed after closing private tabs PUBLISHED

Description (CNA)

Cookie storage for non-HTML temporary documents was being shared incorrectly with normal browsing content, allowing information from private tabs to escape Incognito mode even after the user closed all tabs. This vulnerability was fixed in Firefox for iOS 143.1.

Affected (CNA)

Vendor / product	Versions
Mozilla / Firefox for iOS	unaffected 143.1 through *

CWE

No CWE identifiers supplied.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1684624
https://www.mozilla.org/security/advisories/mfsa2025-79/

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.