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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

MEDIUM
4
CVSS Score
Published: September 30, 2025 at 12:49 PM UTC
Updated: October 5, 2026 at 03:10 PM UTC
1 product affected across 1 vendorFirefox

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Severity
MEDIUM4
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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 affects Firefox for iOS < 143.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 143.1.0
Vendor states this is fixed in 143.1 (unaffected)
Affected range stops below 143.1.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Issue TrackingPermissions Required
Source: cverecord
https://bugzilla.mozilla.org/show_bug.cgi?id=1684624
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2025-79/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4MEDIUMCISA-ADP
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-359

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