SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type Vulnerability
SmarterTools — SmarterMail
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.
10.0
85.7%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Published
- Dec 29, 2025
- Modified
- Jun 17, 2026
- Added to KEV
- Jan 26, 2026
- Federal patch due
- Feb 16, 2026
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
8 foundWeaponization
Public repositories whose name or description references CVE-2025-52691, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
- rxerium/CVE-2025-52691★ 19
Detection for CVE-2025-52691
updated Jul 13, 2026
- watchtowrlabs/watchTowr-vs-SmarterMail-CVE-2025-52691★ 19
updated Jul 13, 2026
- DeathShotXD/CVE-2025-52691-APT-PoC★ 3
An enhanced proof-of-concept exploit for CVE-2025-52691 (SmarterMail Arbitrary File Upload RCE) with APT-level features like stealth obfuscation, persistence, exfiltration, and interactive mode. For educational and authorized testing only. Credits to the original PoC by yt2w/CVE-2025-52691.
updated Apr 9, 2026
- rimbadirgantara/CVE-2025-52691-poc★ 3
updated May 16, 2026
- you-ssef9/CVE-2025-52691★ 1
This repository contains a safe Proof of Concept (PoC) to detect vulnerable SmarterMail versions affected by CVE‑2025‑52691. The script performs version detection only and does not exploit the vulnerability.
updated Mar 6, 2026
- nxgn-kd01/smartermail-cve-scanner★ 1
CVE-2025-52691 Scanner - Detects vulnerable SmarterMail installations (CVSS 10.0 RCE)
updated Jan 5, 2026
- mohammadzarnian1357/Ashwesker-CVE-2025-52691★ 0
CVE-2025-52691
updated Jan 1, 2026
- Udyz/CVE-2025-52691★ 0
updated Dec 30, 2025
References
Frequently asked questions
What is CVE-2025-52691?
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.
How severe is CVE-2025-52691?
CVE-2025-52691 has a CVSS base score of 10.0 out of 10 (CVSS 3.1).
Is CVE-2025-52691 actively exploited in the wild?
Yes. CVE-2025-52691 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Jan 26, 2026, meaning CISA has confirmed evidence of active exploitation. It is also flagged as used in ransomware campaigns.
What is the EPSS score for CVE-2025-52691?
85.7% - meaning FIRST.org's EPSS model estimates a 85.7% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2025-52691?
Yes - a public Nuclei template referencing CVE-2025-52691 exist in public repositories we checked. We also found 8 public GitHub repositories referencing this CVE.
What type of vulnerability is CVE-2025-52691?
CVE-2025-52691 is classified under CWE-434 (CWE-434 Unrestricted Upload of File with Dangerous Type).
Cross-checked against
Impactr finds and proves whether CVE-2025-52691 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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