CVE-2026-53899

MEDIUM EPSS 0.9%
Published Jun 16, 20261w ago · Modified Jun 17, 20261w ago
6.5 CVSS 3.1
Medium
Find Similar
Published Jun 16, 2026 1w ago
Last Modified Jun 17, 2026 1w ago

Description

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 Details

Base Score
6.5
Exploitability
3.9
Impact
2.5
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
0.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-345

Affected Products 1

VendorProductVersionRange
mozillafirefox_mobile* <152.0

References 2

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=2042909
    Permissions Required
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2026-56/
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.