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.
References (7)
Core 7
Core References
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/
Scores
CVSS v3
9.1
EPSS
0.0041
EPSS Percentile
61.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
total
Details
CWE
CWE-653
Status
published
Products (9)
mozilla/firefox
< 115.23
mozilla/firefox
< 138.0
Mozilla/Firefox
115.23 - 115.*
Mozilla/Firefox
128.10 - 128.*
Mozilla/Firefox
138
mozilla/thunderbird
< 128.10.0
mozilla/thunderbird
< 138.0
Mozilla/Thunderbird
128.10 - 128.*
Mozilla/Thunderbird
138
Published
Apr 29, 2025
Tracked Since
Feb 18, 2026