CVE-2025-52691

unknown KEV

Published 2026-01-26 · Modified 2026-01-26

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

2.5

Description

SmarterTools SmarterMail contains an unrestricted upload of file with dangerous type vulnerability that could allow an unauthenticated attacker to upload arbitrary files to any location on the mail server, potentially enabling remote code execution.

CISA KEV

Vendor: SmarterTools
Product: SmarterMail
Due date: 2026-02-16

Predictions

Exploit likelihood

99%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Metasploit modules

exploit_multi/http/smartermail_guid_file_upload rank 600

SmarterTools SmarterMail GUID File Upload Vulnerability

Source fetch failed: fetch_error — view the original via the link above.

References

https://www.smartertools.com/smartermail/release-notes/current ; https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2025-124/ ; https://nvd.nist.gov/vuln/detail/CVE-2025-52691

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.