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CVE-2025-52691

Upload Arbitrary Files

Published: Dec 29, 2025Updated: Jan 27, 2026 Sources: CVE List NVDCWE-434
NVD MITRE
10.0CVSSCRITICAL
EPSS Score
85.5%
Top 0.3%
CISA KEV
Active Exploitation
Since Jan 26, 2026
Exploits
1 Known
Remediation
Patch Available
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Description

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-434

Affected Products

smartermailsmartertools
Mixed
Communications / email-server-client
SmarterMailSmarterTools
Mixed
Communications / email-server-client
smartertoolscommercialCommunicationsaka smartermail, smarterstats, smartertrack

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Jan 26, 2026
Remediation due:Feb 16, 2026
Ransomware:Known ransomware use

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.

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

3 techniques
Command and Control
Initial Access
Persistence
View detailed technique mapping

References

https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2025-124/
csa.gov.sg
https://github.com/watchtowrlabs/watchTowr-vs-SmarterMail-CVE-2025-52691?ref=labs.watchtowr.com
github.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-52691
cisa.gov

Timeline

Published
Dec 29, 2025
Added to CISA KEV
Jan 26, 2026
Last Updated
Jan 27, 2026
News mentions
2

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