Threat Intelligence / CVE / CVE-2025-52691

CVE-2025-52691

CISA KEV

CVSS 10 (CRITICAL) · EPSS 87.3% · Published 2025-12-29

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 v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weaknesses (CWE)

CWE-434

Threats tracking this CVE

SmarterMail Dual-CVE Pre-Auth RCE Chain — CVE-2026-23760 Admin Password Reset + CVE-2026-24423 ConnectToHub RCE, CISA KEV, Mass Automated Exploitation, 2-Day Patch Weaponization via .NET Decompiler — CRITICAL

References

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

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