MSRXVulnerabilities / CVE-2025-52691
CVE-2025-52691
Published 2025-12-29 · Analyzed
CVE-2025-52691
SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type Vulnerability
Exploited in the wild: CISA added it to the Known Exploited Vulnerabilities catalog on 2026-01-26, with a fix-by date of 2026-02-16. Patch it first.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
10.0 CRITICAL
CVSS 3.1 · CNA
CVSS 3.1 · CNA
86%
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
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.
Scores
Affected products
- smartertools smartermail: < 100.0.9413
Weakness: CWE-434
3 references (advisories, patches, write-ups)
- https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2025-124/ · Third Party Advisory
- https://github.com/watchtowrlabs/watchTowr-vs-SmarterMail-CVE-2025-52691?ref=labs.watchtowr.com · Exploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-52691 · US Government Resource
Sources: NVD, CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.