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VulnerabilityPublished Updated

CVE-2023-3417: Mozilla Thunderbird

Affects Mozilla ThunderbirdSource CVE Database V5

0

Not known to be exploited : upgrade to 115.0.1 or 102.13.1 when convenient.

Data as of 26 Oct 2026, 09:08 UTC

Severity
Medium

Rated Medium by the CNA (mozilla) · No CVSS score from NVD or the CNA

EPSS
0.6% chance of exploitation in 30 days – higher than 51% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 115.0.1, 102.13.1

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Jul 2023

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: 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 26 Oct 2026.

What to do

Upgrade Mozilla Thunderbird to 115.0.1 or 102.13.1.

Affected software

ProductAffectedFixed in
Mozilla ThunderbirdAffected
  • <115.0.1
  • <102.13.1
Fixed in
  • 115.0.1
  • 102.13.1

AI-suggested

Mozilla has released fixed versions Thunderbird 115.0.1 and 102.13.1 that address this vulnerability by removing the Text Direction Override character from filenames and correctly displaying file extensions. Users should upgrade to these versions or later to mitigate this issue.

Description

Mozilla Thunderbird versions prior to 115.0.1 and 102.13.1 allowed the use of the Text Direction Override Unicode character in email attachment filenames. This could cause an attachment to be displayed with a misleading file extension, such as showing an executable file as a document. The issue is addressed in Thunderbird 115.0.1 and 102.13.1, which strip this character and correctly display the file extension.

References

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