CVE-2025-5266CWE-200information-disclosure

CVE-2025-5266

Medium · published May 27, 2025

CVSS v3.1
4.3
EPSS
0%
Percentile
24.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00327 · 24.5th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2025-05-27T17:15Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 128.11.0128.11.0
mozilla/firefox< 139.0139.0
References (7)
https://bugzilla.mozilla.org/show_bug.cgi?id=1965628 · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-42/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-44/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-45/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-46/ · [email protected]https://lists.debian.org/debian-lts-announce/2025/05/msg00043.html · af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 27 MAY 12:29Z
    Script element events leaked cross-origin resource status
    cvelistv5