CVE-2026-1657

EventPrime <= 4.2.8.4 - Missing Authorization to Unauthenticated Image Upload via 'ep_upload_file_media' AJAX Endpoint

2026-02-16 17:29
Tharadol Suksamran (d3kc4rt_1)

Strategic Overview

Status
Patched in 4.2.8.5
Affected Plugin
EventPrime – Events Calendar, Bookings, Tickets & AI
Affected Version
<= 4.2.8.4
CVSS
5.3Medium
Weakness type
CWE-862 · Missing Authorization
CVE
CVE-2026-1657
View all EventPrime – Events Calendar, Bookings, Tickets & AI vulnerabilities

At a glance

CVE-2026-1657 is a medium-severity Missing Authorization vulnerability in the EventPrime WordPress plugin, affecting versions <= 4.2.8.4. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 4.2.8.5; sites on affected versions should update now. Disclosed February 2026, reported by Tharadol Suksamran (d3kc4rt_1).

Vulnerability Overview

The EventPrime plugin for WordPress is vulnerable to unauthorized image file upload in all versions up to, and including, 4.2.8.4. This is due to the plugin registering the upload_file_media AJAX action as publicly accessible (nopriv-enabled) without implementing any authentication, authorization, or nonce verification despite a nonce being created. This makes it possible for unauthenticated attackers to upload image files to the WordPress uploads directory and create Media Library attachments via the ep_upload_file_media endpoint.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-862: Missing Authorization

Reaching this weakness in EventPrime <= 4.2.8.4 takes no account at all. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For EventPrime the fix is 4.2.8.5: builds <= 4.2.8.4 are affected, anything from 4.2.8.5 onward is not.

Remediation

Update to version 4.2.8.5, or a newer patched version

How does WordSec protect against this?

This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: EventPrime 4.2.8.5 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-1657https://www.wordfence.com/threat-intel/vulnerabilities/id/42aa82ff-0d37-4040-b8fc-84d29534a4b7https://nvd.nist.gov/vuln/detail/CVE-2026-1657

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C