# CVE-2026-3300: Everest Forms Pro <= 1.9.12 - Unauthenticated Remote Code Execution via Calculation Field

> Unauthenticated attackers can execute arbitrary PHP code on servers using the Everest Forms Pro plugin if the Complex Calculation feature is enabled.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 Mar 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-jfqc-5rvh-wp99

## What is CVE-2026-3300?

CVE-2026-3300 is a critical code injection vulnerability in WPEverest Everest Forms Pro, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Everest Forms Pro plugin for WordPress is vulnerable to Remote Code Execution via PHP Code Injection in all versions up to, and including, 1.9.12. This is due to the Calculation Addon's process_filter() function concatenating user-submitted form field values into a PHP code string without proper escaping before passing it to eval(). The sanitize_text_field() function applied to input does not escape single quotes or other PHP code context characters. This makes it possible for unauthenticated attackers to inject and execute arbitrary PHP code on the server by submitting a crafted value in any string-type form field (text, email, URL, select, radio) when a form uses the "Complex Calculation" feature.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-3300?


## How do I fix CVE-2026-3300?

No fix has been published for CVE-2026-3300 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3300 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3300 exists.

Public exploit code:

- CVE-2026-3300 (github_poc): https://github.com/HORKimhab/CVE-2026-3300
- https://github.com/adamshaikhma/CVE-2026-3300 (github_poc): https://github.com/adamshaikhma/CVE-2026-3300
- Everest Forms Pro <= 1.9.12 - Unauthenticated RCE via Calculation Formula Injection (nuclei): http/cves/2026/CVE-2026-3300.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3300 and fix it if it is affected.

What it is: CVE-2026-3300 is a critical code injection vulnerability in WPEverest Everest Forms Pro, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3300 exists.

Affected product: WPEverest Everest Forms Pro. 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-2026-3300/ (Markdown: https://insights.sbomify.com/CVE-2026-3300/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3300
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3300
- OSV: https://osv.dev/vulnerability/CVE-2026-3300

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3300/
Summaries are generated and may contain mistakes; the official description above is the record.