Bug 2366283 (CVE-2025-3909) - CVE-2025-3909 thunderbird: JavaScript Execution via Spoofed PDF Attachment and file:/// Link
Summary: CVE-2025-3909 thunderbird: JavaScript Execution via Spoofed PDF Attachment an...
Keywords:
Status: NEW
Alias: CVE-2025-3909
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-05-14 18:01 UTC by OSIDB Bzimport
Modified: 2025-09-01 08:29 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2025:8196 0 None None None 2025-05-27 10:01:08 UTC
Red Hat Product Errata RHSA-2025:8203 0 None None None 2025-05-27 12:22:35 UTC
Red Hat Product Errata RHSA-2025:8324 0 None None None 2025-05-29 21:28:25 UTC
Red Hat Product Errata RHSA-2025:8325 0 None None None 2025-05-29 22:54:05 UTC
Red Hat Product Errata RHSA-2025:8326 0 None None None 2025-05-29 19:29:53 UTC
Red Hat Product Errata RHSA-2025:8391 0 None None None 2025-06-02 17:29:01 UTC
Red Hat Product Errata RHSA-2025:8507 0 None None None 2025-06-04 11:43:50 UTC
Red Hat Product Errata RHSA-2025:8594 0 None None None 2025-06-05 10:54:50 UTC
Red Hat Product Errata RHSA-2025:8756 0 None None None 2025-06-10 09:38:27 UTC
Red Hat Product Errata RHSA-2025:8784 0 None None None 2025-06-10 15:05:11 UTC

Description OSIDB Bzimport 2025-05-14 18:01:33 UTC 
Thunderbird's handling of the X-Mozilla-External-Attachment-URL header can be exploited to execute JavaScript in the file:/// context. By crafting a nested email attachment (message/rfc822) and setting its content type to application/pdf, Thunderbird may incorrectly render it as HTML when opened, allowing the embedded JavaScript to run without requiring a file download. This behavior relies on Thunderbird auto-saving the attachment to /tmp and linking to it via the file:/// protocol, potentially enabling JavaScript execution as part of the HTML. This vulnerability affects Thunderbird < 128.10.1 and Thunderbird < 138.0.1.
Comment 1 errata-xmlrpc 2025-05-27 10:01:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:8196 https://access.redhat.com/errata/RHSA-2025:8196
Comment 2 errata-xmlrpc 2025-05-27 12:22:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:8203 https://access.redhat.com/errata/RHSA-2025:8203
Comment 3 errata-xmlrpc 2025-05-29 19:29:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Extended Update Support

Via RHSA-2025:8326 https://access.redhat.com/errata/RHSA-2025:8326
Comment 4 errata-xmlrpc 2025-05-29 21:28:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2025:8324 https://access.redhat.com/errata/RHSA-2025:8324
Comment 5 errata-xmlrpc 2025-05-29 22:54:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2025:8325 https://access.redhat.com/errata/RHSA-2025:8325
Comment 6 errata-xmlrpc 2025-06-02 17:29:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2025:8391 https://access.redhat.com/errata/RHSA-2025:8391
Comment 7 errata-xmlrpc 2025-06-04 11:43:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Via RHSA-2025:8507 https://access.redhat.com/errata/RHSA-2025:8507
Comment 8 errata-xmlrpc 2025-06-05 10:54:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2025:8594 https://access.redhat.com/errata/RHSA-2025:8594
Comment 9 errata-xmlrpc 2025-06-10 09:38:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:8756 https://access.redhat.com/errata/RHSA-2025:8756
Comment 10 errata-xmlrpc 2025-06-10 15:05:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2025:8784 https://access.redhat.com/errata/RHSA-2025:8784
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