CVE-2025-5266

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-5266
Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability affects Firefox < 139, Firefox ESR < 128.11, Thunderbird < 139, and Thunderbird < 128.11.

6.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1965628 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-42/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-44/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-45/
https://www.mozilla.org/security/advisories/mfsa2025-46/
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
History

11 Jun 2025, 12:15

Type Values Removed Values Added
Summary (en) Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability affects Firefox < 139 and Firefox ESR < 128.11. (en) Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability affects Firefox < 139, Firefox ESR < 128.11, Thunderbird < 139, and Thunderbird < 128.11.
References
  • () https://www.mozilla.org/security/advisories/mfsa2025-45/ -
  • () https://www.mozilla.org/security/advisories/mfsa2025-46/ -

04 Jun 2025, 20:13

Type Values Removed Values Added
References () https://bugzilla.mozilla.org/show_bug.cgi?id=1965628 - () https://bugzilla.mozilla.org/show_bug.cgi?id=1965628 - Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2025-42/ - () https://www.mozilla.org/security/advisories/mfsa2025-42/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2025-44/ - () https://www.mozilla.org/security/advisories/mfsa2025-44/ - Vendor Advisory
CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
First Time Mozilla firefox
Mozilla

28 May 2025, 15:01

Type Values Removed Values Added
Summary
  • (es) Los elementos de script que cargaban recursos de origen cruzado generaban eventos de carga y error que filtraban información, lo que facilitaba los ataques XS-Leaks. Esta vulnerabilidad afecta a Firefox &lt; 139 y Firefox ESR &lt; 128.11.

27 May 2025, 18:15

Type Values Removed Values Added
CWE CWE-200
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 6.5

27 May 2025, 13:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-05-27 13:15

Updated : 2025-06-11 12:15

NVD link : CVE-2025-5266

Mitre link : CVE-2025-5266

CVE.ORG link : CVE-2025-5266

JSON object : View

Products Affected

mozilla

  • firefox
CWE
CWE-200

Exposure of Sensitive Information to an Unauthorized Actor