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VulnerabilityPublished Updated

CVE-2025-3875: case the server · Thunderbird Parses Addresses

Source GCVE Database

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Not known to be exploited · CVSS 7.5 High · fixed in 138.0.1 : patch affected systems soon.

Data as of 30 Oct 2026, 01:41 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 138.0.1, 128.10.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 May 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

AI-suggested

This vulnerability is fixed in Thunderbird versions 128.10.1 and 138.0.1. Users and administrators should upgrade to at least these versions to remediate the issue. No additional mitigations are required once updated. The vendor advisory confirms the fix is available and recommends applying the official updates.

Description

Thunderbird versions prior to 128.10.1 and 138.0.1 contain a vulnerability where the email client parses the From header improperly, allowing sender spoofing if the mail server permits invalid From addresses. Specifically, malformed From headers with multiple addresses can cause Thunderbird to display a spoofed sender address. This vulnerability has been fixed in Thunderbird 128.10.1 and 138.0.1.

References

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