CVE-2025-5263

MEDIUM

Mozilla Firefox < 115.24.0 - Origin Validation Error

Title source: rule

Description

Error handling for script execution was incorrectly isolated from web content, which could have allowed cross-origin leak attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 115.24, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

References (8)

[Mailing List] https://lists.debian.org/debian-lts-announce/2025/05/msg00043.html

[Mailing List] https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html

[Permissions Required] https://bugzilla.mozilla.org/show_bug.cgi?id=1960745

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-42/

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-43/

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-44/

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-45/

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-46/

Scores

CVSS v3 4.3

EPSS 0.0018

EPSS Percentile 39.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-346

Status published

Products (7)

mozilla/firefox < 115.24.0

mozilla/firefox < 139.0

Mozilla/Firefox 115.24 - 115.*

Mozilla/Firefox 128.11 - 128.*

Mozilla/Firefox 139

Mozilla/Thunderbird 128.11 - 128.*

Mozilla/Thunderbird 139

Published May 27, 2025

Tracked Since Feb 18, 2026