# CVE-2026-3309: Code injection in Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress

> Unauthenticated attackers can execute arbitrary shortcodes via crafted billing fields in the ProfilePress WordPress plugin, potentially leading to code execution.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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:** 4 Apr 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-76wj-rr8p-qvr3

## What is CVE-2026-3309?

CVE-2026-3309 is a medium-severity code injection vulnerability in properfraction Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress, published on 4 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 4.16.11. This is due to the plugin allowing user-supplied billing field values from the checkout process to be interpolated into shortcode template strings that are subsequently processed without proper sanitization of shortcode syntax. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes by submitting crafted billing field values during the checkout process.

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

## Which versions are affected by CVE-2026-3309?


## How do I fix CVE-2026-3309?

No fix has been published for CVE-2026-3309 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3309 being exploited?

There is no known exploitation of CVE-2026-3309 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3309 and fix it if it is affected.

What it is: CVE-2026-3309 is a medium-severity code injection vulnerability in properfraction Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress, published on 4 Apr 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-2026-3309 in the wild and no public exploit code.

Affected product: properfraction Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress. 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-2026-3309/ (Markdown: https://insights.sbomify.com/CVE-2026-3309/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3309
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3309
- OSV: https://osv.dev/vulnerability/CVE-2026-3309

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-3309/
Summaries are generated and may contain mistakes; the official description above is the record.