CVE-2025-52691 SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type
Unauthenticated attackers can upload arbitrary files to any location on SmarterMail, potentially enabling remote code execution.
- Exploited in the wild
- Since 26 Jan 2026
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-52691?
CVE-2025-52691 is a critical vulnerability in SmarterTools SmarterMail, published on 29 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-434
Which versions are affected by CVE-2025-52691?
It affects 1 product.
Products include Smartertools Smartermail.
How do I fix CVE-2025-52691?
No fix has been published for CVE-2025-52691 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 16 Feb 2026.
Is CVE-2025-52691 being exploited?
Yes. Attackers have exploited CVE-2025-52691 in the wild since at least 26 Jan 2026, including in ransomware campaigns.
Public exploit code: 1 Metasploit module, 1 Nuclei template and 8 proofs of concept on GitHub.
Other vulnerabilities in SmarterTools SmarterMail
- CVE-2026-24423 SmarterTools SmarterMail Missing Authentication for Critical Function
- CVE-2026-23760 SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel
- CVE-2021-32234 Code injection in n/a
- CVE-2019-7214 Deserialization in n/a
- CVE-2026-7807 SmarterTools SmarterMail < Build 9560 Server Local File Inclusion via the /api/v1/report/summary/{type} API
Sources
Also known as GHSA-c9vj-8fwr-4gvq.