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CVE-2025-5266

Date: May 27, 2025

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.

Severity Score

Related Resources (7)

https://bugzilla.mozilla.org/show_bug.cgi?id=1965628
https://nvd.nist.gov/vuln/detail/CVE-2025-5266
https://www.mozilla.org/security/advisories/mfsa2025-44/
https://www.mozilla.org/security/advisories/mfsa2025-46/
https://www.mozilla.org/security/advisories/mfsa2025-45/
https://www.mozilla.org/security/advisories/mfsa2025-42/
https://www.mend.io/vulnerability-database/CVE-2025-5266

Severity Score

Weakness Type (CWE)

Exposure of Sensitive Information to an Unauthorized Actor

CWE-200

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

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