CVE-2026-1657

MEDIUM

EventPrime WordPress Plugin <4.2.8.4 - Unauthenticated File Upload

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2026-1657. PoCs published by d3kc4rt1, Vimash-Dilsara.

AI-analyzed exploit summary This repository provides a detailed technical analysis of CVE-2026-1657, an unauthenticated arbitrary file upload vulnerability in the EventPrime WordPress plugin. It includes root cause analysis, proof-of-concept steps, and remediation guidance.

Description

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.

Exploits (2)

nomisec WRITEUP
by d3kc4rt1 · poc
https://github.com/d3kc4rt1/CVE-2026-1657

This repository provides a detailed technical analysis of CVE-2026-1657, an unauthenticated arbitrary file upload vulnerability in the EventPrime WordPress plugin. It includes root cause analysis, proof-of-concept steps, and remediation guidance.

Classification
Writeup 100%
Attack Type
Auth Bypass
Complexity
Trivial
Reliability
Reliable
Target: EventPrime WordPress Plugin <= 4.2.8.1
No auth needed
Prerequisites: WordPress site with EventPrime plugin <= 4.2.8.1
devstral-2 · analyzed Apr 10, 2026 Full analysis →
nomisec WORKING POC
by Vimash-Dilsara · poc
https://github.com/Vimash-Dilsara/-CVE-2026-1657

This repository contains a functional exploit for CVE-2026-1657, targeting an unauthenticated file upload vulnerability in the EventPrime WordPress plugin via the 'ep_upload_file_media' AJAX endpoint. The script checks the plugin version, verifies vulnerability status, and attempts to upload a file to the target system.

Classification
Working Poc 95%
Attack Type
Other
Complexity
Trivial
Reliability
Reliable
Target: EventPrime Event Calendar Management WordPress plugin (versions before 4.2.8.4)
No auth needed
Prerequisites: WordPress site with vulnerable EventPrime plugin installed · Network access to the target site
devstral-2 · analyzed Apr 09, 2026 Full analysis →

References (6)

Core 6
Core References

Scores

CVSS v3 5.3
EPSS 0.0038
EPSS Percentile 29.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-862
Status published
Products (1)
metagauss/EventPrime – Events Calendar, Bookings and Tickets < 4.2.8.4
Published Feb 17, 2026
Tracked Since Feb 18, 2026