Bug 2562323 (CVE-2026-118175) - CVE-2026-118175 thunderbird: Content of other messages could be included when replying to a crafted message
Summary: CVE-2026-118175 thunderbird: Content of other messages could be included when...
Keywords:
Status: NEW
Alias: CVE-2026-118175
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-27 18:34 UTC by OSIDB Bzimport
Modified: 2026-10-29 14:41 UTC (History)
5 users (show)

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

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Description OSIDB Bzimport 2026-10-27 18:34:16 UTC 
When replying to, forwarding, or editing a crafted email message as new, Thunderbird could embed parts of a different message stored in the same folder into the message being composed, without showing a blocked content warning. If the user sent the message, the content of the other message was disclosed to the recipients. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.
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