# CVE-2026-3645: Missing authorization in Punnel – Landing Page Builder

> Authenticated subscribers can overwrite plugin settings and API keys, allowing them to modify site content via the public API.

- **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:** 21 Mar 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-p6xf-h6c6-2mx9

## What is CVE-2026-3645?

CVE-2026-3645 is a medium-severity missing authorization vulnerability in Punnel – Landing Page Builder, published on 21 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Punnel – Landing Page Builder plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 1.3.1. The save_config() function, which handles the 'punnel_save_config' AJAX action, lacks any capability check (current_user_can()) and nonce verification. This makes it possible for authenticated attackers, with Subscriber-level access and above, to overwrite the plugin's entire configuration including the API key via a POST request to admin-ajax.php. Once the API key is known (because the attacker set it), the attacker can use the plugin's public API endpoint (sniff_requests() at /?punnel_api=1) — which only validates requests by comparing a POST token against the stored api_key — to create, update, or delete arbitrary posts, pages, and products on the site.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-3645?


## How do I fix CVE-2026-3645?

No fix has been published for CVE-2026-3645 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3645 being exploited?

There is no known exploitation of CVE-2026-3645 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3645 and fix it if it is affected.

What it is: CVE-2026-3645 is a medium-severity missing authorization vulnerability in Punnel – Landing Page Builder, published on 21 Mar 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-2026-3645 in the wild and no public exploit code.

Affected product: Punnel – Landing Page Builder. 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-2026-3645/ (Markdown: https://insights.sbomify.com/CVE-2026-3645/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3645
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3645
- OSV: https://osv.dev/vulnerability/CVE-2026-3645

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3645/
Summaries are generated and may contain mistakes; the official description above is the record.