CVE-2025-5266

MEDIUM EPSS 17.5%
Published May 27, 20251y ago · Modified Jun 17, 20261w ago
4.3 CVSS 3.1
Medium
Find Similar
Published May 27, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

CVSS Details

Base Score
4.3
Exploitability
2.8
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Low
Integrity None
Availability None

Threat Intelligence

EPSS Exploit Probability
17.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor Information Exposure

Affected Products 2

VendorProductVersionRange
mozillafirefox* <128.11.0
mozillafirefox* <139.0

References 7

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1965628
    Permissions Required
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00043.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-42/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-44/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-45/
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-46/

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.