WordPress WP User Frontend Plugin <= 4.2.8 is vulnerable to a medium priority Arbitrary File Upload

Medium priority Mitigate with Patchstack
<= 4.2.8Vulnerable version(s)
4.2.9Patched version
WordPress plugin
Active VDP
27 Feb, 2026

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Risks

CVSS 8.8

This vulnerability is moderately dangerous and expected to become exploited.

Note by Patchstack

Note that this vulnerability occurs due to a logical mistake in the code. For this reason, all legitimate and illegitimate requests are blocked to cover all scenarios.

8.8

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 patched version.

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Update to version 4.2.9 or later.

Update to version 4.2.9 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

Published by Patchstack

27 Feb, 2026

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