CVE-2025-52691 kev+ ransomware in the critical feed json
Upload Arbitrary Files
published 2025-12-29 10 mo ago modified 2026-10-07 32 d ago also EUVD-2025-205544
- cvss
- 10.0
- version 3.1, CNA
- cisa kev
- Exploited
- added 2026-01-26, used in ransomware
- epss
- 85.7%
- EPSS 85.7% chance of exploitation in 30 days, percentile 99.7%
- public exploits
- 1
- Metasploit, plus a Nuclei check
Summary
Successful exploitation of the vulnerability could allow an unauthenticated attacker to upload arbitrary files to any location on the mail server, potentially enabling remote code execution.
Patch / fix
cisa required action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- smartertools smartermail 100.0.9413
Timeline
- First public exploit (Metasploit exploit/multi/http/smartermail_guid_file_upload)
- Published
- Added to CISA KEV
- CISA SSVC: exploitation active
- CISA patch deadline
Known exploited
- Added
- 9 mo ago
- Patch by
- 2026-02-16 (8 mo ago)
- Ransomware
- Known to be used in ransomware campaigns
- Required action
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Vendor, product
- SmarterTools, SmarterMail
- CISA name
- SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type Vulnerability
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- yes
- Technical impact
- total
- Assessed
- 9 mo ago
Exploit prediction
85.66% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Metasploit exploit/multi/http/smartermail_guid_file_upload SmarterTools SmarterMail GUID File Upload Vulnerability metasploit exploit, excellent rank, 2025-10-09
- Nuclei template SmarterMail - Unrestricted File Upload nuclei detection template
- github.com https://github.com/watchtowrlabs/watchTowr-vs-SmarterMail-CVE-2025-52691?ref=labs.watchtowr.com referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected products
- SmarterTools SmarterMail
Classification
- Weakness
-
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
-
github.com
/watchtowrlabs/watchTowr-vs-SmarterMail-CVE-2025-52691?ref=labs.watchtowr.com
exploit, third-party-advisory
-
csa.gov.sg
/alerts-and-advisories/alerts/al-2025-124/
third-party-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-52691
government-resource, us-government-resource
Sources
- CVE List CVE-2025-52691
- NVD CVE-2025-52691
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