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CVE record · CVE-2025-52691

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CVSS 10.0 CriticalCriticalIn CISA KEV · ransomwareEPSS 0.86 · 99th percentile

Critical, because:

  • In CISA’s KEV catalogue since 26 Jan 2026: it is known to be exploited.
  • CVSS score 10.0: 9.0 or more.
  • CVSS score 10.0 (7.0 or more) and EPSS 0.86 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the CVE Program (CNA: CSA) at 29 Dec 2025, 02:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
SmarterTools SmarterMail
  • affected SmarterMail versions Build 9406 and earlier
Other versions: unknown
Identifiers
CVE-2025-52691
CNA
CSA
Weakness (CWE)
CWE-434
Tags
Published
29 Dec 2025
Updated
26 Feb 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
10.0 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CNA (CSA)
  • CISA KEV Listed since 26 Jan 2026: known to be exploited. CISA reports use in ransomware campaigns.
  • EPSS 0.86, the 99th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 29 Dec 2025. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.