CVE-2025-13516Network attack vector

Unauthenticated code execution via unvalidated email attachments

Published Dec 2, 2025 · Updated Apr 8, 2026

Unrestricted file upload in Brainstorm Force SureMail 1.9.0 and earlier allows remote attackers to execute code via emailed attachments. The save_file() function copies attachments into a web-accessible directory without validating extensions or content types and assigns predictable MD5-derived names. Exploitation requires a public form that emails attachments and a server where PHP executes despite the plugin's Apache-specific directory protection.

CVSS severity8.1
High
EPSS probability0.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Brainstorm Force SureMail 1.9.0 and earlier allows remote attackers to execute code via emailed attachments. The save_file() function copies attachments into a web-accessible directory without validating extensions or content types and assigns predictable MD5-derived names. Exploitation requires a public form that emails attachments and a server where PHP executes despite the plugin's Apache-specific directory protection.

The record

CVE
CVE-2025-13516
Published
Dec 2, 2025
Updated
Apr 8, 2026
Vendor
Presto Made, Inc.
Product
SureMail
Classifications
CWE-434, T1505.003, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Presto Made, Inc. · SureMailversion=0 <=1.9.0

Published CVSS scores

8.1WordfenceCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component: Web Shell
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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