CVE-2025-6430CWE-79cross-site-scripting

CVE-2025-6430

Medium · published June 24, 2025

CVSS v3.1
6.1
EPSS
0%
Percentile
17.9
In the wild
Unconfirmed
What it is

When a file download is specified via the `Content-Disposition` header, that directive would be ignored if the file was included via a `<embed>` or `<object>` tag, potentially making a website vulnerable to a cross-site scripting attack. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00268 · 17.9th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2025-06-24T17:15Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 128.12.0128.12.0
mozilla/firefox< 140.0140.0
References (7)
https://bugzilla.mozilla.org/show_bug.cgi?id=1971140 · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-51/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-53/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-54/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-55/ · [email protected]https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html · af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 24 JUN 12:28Z
    Content-Disposition header ignored when a file is included in an embed or object tag
    cvelistv5