WordPress SureMail Plugin <= 1.9.0 is vulnerable to a high priority Arbitrary File Upload

High priority Mitigate with Patchstack
<= 1.9.0Vulnerable version(s)
1.9.1Fixed version
WordPress plugin
Active VDP
3 Dec, 2025

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Risks

CVSS 10

This vulnerability is highly dangerous and expected to become exploited.

Note by Patchstack

While our virtual patch significantly reduces the attack surface of this vulnerability, due to its specific nature, we recommend to update to the patched version as soon as possible.

10

Arbitrary File Upload

This could allow a malicious actor to upload any type of file to your website. This can include backdoors which are then executed to gain further access to your website.

CVSS score is a way to evaluate and rank reported vulnerabilities in a standardized and repeatable way but which is not ideal for WordPress.

Solutions

We advise to mitigate or resolve the vulnerability immediately.

Automatically mitigate vulnerabilities and keep your websites safe.

Patchstack has issued a mitigation rule to block any attacks until you have updated to a fixed version.

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Update to version 1.9.1 or later.

Update to version 1.9.1 or later to resolve the vulnerability. Patchstack users can turn on auto-update for vulnerable plugins only.

Details

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WordPress plugin
Active VDP

Timeline

Early warning sent out to Patchstack customers

3 Dec, 2025

Published by Patchstack

3 Dec, 2025

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