CVE-2023-3417: Mozilla Thunderbird
Affects Mozilla ThunderbirdSource CVE Database V5
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
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
Disclosed: evidence found.
CVE published 24 Jul 2023
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| Mozilla Thunderbird | Affected
| Fixed in
|
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
- bugzilla.mozilla.org/show_bug.cgi?id=1835582 (opens in a new tab)
- lists.debian.org/debian-lts-announce/2023/07/msg00032.html (opens in a new tab)
- debian.org/security/2023/dsa-5463 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2023-27/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2023-28/ (opens in a new tab)