Upload Arbitrary Files
Affects SmarterMail Build 9406 and earlier, where an unauthenticated user can upload arbitrary files to any location on the mail server. CVSS scores it 10 (critical). No fix is listed in the checked facts.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The affected software is a mail server product, which is vulnerable to unauthenticated file uploads. An attacker exploiting this flaw could place arbitrary files anywhere on the server, potentially allowing them to run malicious code remotely.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original 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.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- SmarterTools SmarterMail
SmarterMail versions Build 9406 and earlier
References 1
csa.gov.sg
Questions about CVE-2025-52691
What does this mean?
An unauthenticated user can upload arbitrary files to any location on the mail server. This could potentially enable remote code execution.Source: csa.gov.sg
Am I affected, and how do I check?
SmarterMail Build 9406 and earlier are affected. Check the installed SmarterMail build number and compare it with Build 9406.Source: csa.gov.sg
What should I do about it?
The checked facts do not name a fixed build, so no upgrade target can be given. Check the vendor's advisory for the first fixed version.Source: csa.gov.sg
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-01-26, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data
What if there's no patch?
The checked facts do not include a workaround or mitigation. Confirm the current status with the vendor before relying on any interim measure.Source: csa.gov.sg