Live › vulnerability › CVE-2025-52691
Go to dashboardSmarterTools SmarterMail, a mail server product, has an unrestricted file upload flaw that lets an unauthenticated attacker write arbitrary files anywhere on the server. The sources say this can lead to remote code execution, and CISA lists it as actively exploited, including in ransomware campaigns.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| smartertools smartermail | vendor | < 100.0.9413 | 100.0.9413 |
| SmarterTools SmarterMail | vendor | – | – |
Check the installed SmarterMail version against the vendor advisory; the sources do not give a version or file path to inspect.
What vendors did on their customers’ behalf. Holds only for traffic through them; patching is still the fix.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
WAF Release - 2026-03-02 · Changelog
New updates and improvements at Cloudflare.
March 2, 2026
This week's release introduces new detections for vulnerabilities in SmarterTools SmarterMail (CVE-2025-52691 and CVE-2026-23760), alongside improvements to an existing Command Injection (nslookup) detection to enhance coverage.
Key Findings
Impact
Successful exploitation of these SmarterMail vulnerabilities could lead to full system compromise or unauthorized administrative access to mail servers. Administrators are strongly encouraged to apply vendor patches without delay.
| Ruleset | Rule ID | Legacy Rule ID | Description | Previous Action | New Action | Comments |
|---|---|---|---|---|---|---|
| Cloudflare Managed Ruleset | ...966ec6b1 | N/A | SmarterMail - Arbitrary File Upload - CVE-2025-52691 | Log | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...ee964a8c | N/A | SmarterMail - Authentication Bypass - CVE-2026-23760 | Log | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...75b64d99 | N/A | Command Injection - Nslookup - Beta | Log | Block | This rule is merged into the original rule "Command Injection - Nslookup" (ID: ...b090ba9a) |
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