Threat Intelligence / CVE / CVE-2025-52691
CVE-2025-52691
CISA KEVAs of 2026-01-27, CVE-2025-52691 is a CVSS 10 (CRITICAL-severity) vulnerability. CISA KEV-listed (known exploited). EPSS exploitation probability 87.3%. Threadlinqs Intelligence tracks 1 threat exploiting it.
Last updated: 2026-01-27
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
Exploitation status
CISA KEV-listed (known exploited)
Threats tracking this CVE
- Storm-1175 Medusa Ransomware Zero-Day Exploitation Campaign (CVE-2026-23760, CVE-2025-10035) — 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
Full detection coverage & IOCs for threats exploiting CVE-2025-52691 are available via the Threadlinqs MCP server (Purple tier). View plans →
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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.