Description
A malicious page could have used the type attribute of an OBJECT tag to override the default browser behavior when encountering a web resource served without a content-type. This could have contributed to an XSS on a site that unsafely serves files without a content-type header. This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.
References (7)
Scores
CVSS v3
6.1
EPSS
0.0004
EPSS Percentile
11.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-116
Status
published
Products (7)
mozilla/firefox
< 140.4.0
mozilla/firefox
< 144.0
Mozilla/Firefox
140.4 - 140.*
Mozilla/Firefox
144
mozilla/thunderbird
< 140.4.0
Mozilla/Thunderbird
140.4 - 140.*
Mozilla/Thunderbird
144
Published
Oct 14, 2025
Tracked Since
Feb 18, 2026