CVE-2025-52691Upload Arbitrary Files
Updated under an hour ago ()
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It affects SmarterTools SmarterMail. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jan 26, 2026; federal agencies had to remediate by Feb 16, 2026, and it is known to be used in ransomware. Treat that date as your deadline.
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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
- 10.0 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-434
- Known exploited
- Added to CISA KEV Jan 26, 2026; federal remediation due Feb 16, 2026; known ransomware useApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 85.66% (percentile 100)
- Assigned by
- CSA
- NVD analysis
- Analyzed
- Record last updated
- Feb 26, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
SmarterTools SmarterMail smartertools:smartermail (from the name) | SmarterMail versions Build 9406 and earlier | CNA record |
smartertools smartermail smartertools:smartermail | before 100.0.9413 | NVD |
References
- 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.comexploit, third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-52691us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.