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Authentication Bypass The advisory has been revoked - it doesn't affect any version of package rhel10/thunderbird-flatpak.src  (opens in a new tab)

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EPSS
0.42% (63rd percentile)

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  • Snyk IDSNYK-CENTOS10-RHEL10THUNDERBIRDFLATPAKSRC-15360193
  • published27 Feb 2026
  • disclosed14 May 2025
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Introduced: 14 May 2025

CVE-2025-3909  (opens in a new tab)
CWE-290  (opens in a new tab)

Amendment

The Centos security team deemed this advisory irrelevant for Centos:10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rhel10/thunderbird-flatpak.src package and not the rhel10/thunderbird-flatpak.src package as distributed by Centos.

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 was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.