# CVE-2026-1657: EventPrime <= 4.2.8.4 - Missing Authorization to Unauthenticated Image Upload via 'ep_upload_file_media' AJAX Endpoint

> Unauthenticated attackers can upload image files to the WordPress uploads directory due to missing authorization checks in the EventPrime plugin.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Feb 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-4x73-7vhc-g4xh

## What is CVE-2026-1657?

CVE-2026-1657 is a medium-severity missing authorization vulnerability in metagauss EventPrime – Events Calendar, Bookings and Tickets, published on 17 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-1657?


## How do I fix CVE-2026-1657?

No fix has been published for CVE-2026-1657 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1657 being exploited?

There is no known exploitation of CVE-2026-1657 in the wild and no public exploit code.

Public exploit code:

-  CVE-2026-1657 exploit Unauthenticated Image Upload via 'ep_upload_file_media' AJAX Endpoint (github_poc): https://github.com/VimashDilshara/-CVE-2026-1657
- Unauthenticated Arbitrary File Upload in EventPrime Plugin (github_poc): https://github.com/d3kc4rt1/CVE-2026-1657

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1657 and fix it if it is affected.

What it is: CVE-2026-1657 is a medium-severity missing authorization vulnerability in metagauss EventPrime – Events Calendar, Bookings and Tickets, published on 17 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-1657 in the wild and no public exploit code.

Affected product: metagauss EventPrime – Events Calendar, Bookings and Tickets. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-1657/ (Markdown: https://insights.sbomify.com/CVE-2026-1657/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1657
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1657
- OSV: https://osv.dev/vulnerability/CVE-2026-1657

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-1657/
Summaries are generated and may contain mistakes; the official description above is the record.