CVE-2026-118175

UNKNOWN 0.0

Content of other messages could be included when replying to a crafted message

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	mozilla
Product	thunderbird
Ecosystems	Browser JavaScript
Industries	Technology
Published	Oct 27, 2026
Last Updated	Oct 27, 2026

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Affected Versions

Mozilla / Thunderbird

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2081720 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-121/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-122/

Credits

YuYoung Sung