CVE-2025-6430

Published: Jun 24, 2025Modified: Jun 17, 2026

6.1

Vector

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

Exploitability: 2.8 / Impact: 2.7

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

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.

Affected (2)

Products: Mozilla: Firefox

1 product

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Mozilla Firefox	Before 140.0
Mozilla Firefox	Before 128.12.0

Related CWEs

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

References (7)

https://bugzilla.mozilla.org/show_bug.cgi?id=1971140

Source: security@mozilla.org

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2025-51/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-53/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-54/

Source: security@mozilla.org

https://www.mozilla.org/security/advisories/mfsa2025-55/

Source: security@mozilla.org

https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html

Source: af854a3a-2127-422b-91ae-364da2661108

https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html

Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

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