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CVE-2025-10859

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

Published: Sep 30, 2025Updated: Apr 13, 2026 Sources: CVE List NVDCWE-359
NVD MITRE
4.0CVSSMEDIUM
EPSS Score
0.1%
Top 98.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:LAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-359

Affected Products

firefoxmozilla
On-premDesktop App
Consumer Software / browser
Firefox for iOSMozilla
On-premDesktop App
Consumer Software / browser
mozillaoss-projectUSConsumer Softwareaka mozilla corp.

Exploitability

Official Patch Available

References

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

Timeline

Published
Sep 30, 2025
Last Updated
Apr 13, 2026

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