Critical severity · published Apr 29, 2025
CVE-2025-4083
A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process…
9.1
CVSS
0.5%
EPSS
No
On KEV
Description
A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process instead of the intended frame, potentially enabling a sandbox escape. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 115.23; before 138.0; 128.0 before 128.10 · source: NVD
TH
Thunderbird · Mozilla
before 128.10.0; before 138.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-4083
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-4083
Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1958350
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-28/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-29/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-30/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-31/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-32/
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