# CVE-2026-3453: Missing authorization in Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress

> Authenticated attackers can cancel or expire any user's subscription by manipulating a parameter, causing loss of paid access.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Mar 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-jp3m-m8r2-v4x3

## What is CVE-2026-3453?

CVE-2026-3453 is a high-severity missing authorization vulnerability in properfraction Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress, published on 11 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The ProfilePress plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 4.16.11. This is due to missing ownership validation on the change_plan_sub_id parameter in the process_checkout() function. The ppress_process_checkout AJAX handler accepts a user-controlled subscription ID intended for plan upgrades, loads the subscription record, and cancels/expires it without verifying the subscription belongs to the requesting user. This makes it possible for authenticated attackers, with Subscriber-level access and above, to cancel and expire any other user's active subscription via the change_plan_sub_id parameter during checkout, causing immediate loss of paid access for victims.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-3453?


## How do I fix CVE-2026-3453?

No fix has been published for CVE-2026-3453 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3453 being exploited?

There is no known exploitation of CVE-2026-3453 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3453 and fix it if it is affected.

What it is: CVE-2026-3453 is a high-severity missing authorization vulnerability in properfraction Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress, published on 11 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-3453 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-2026-3453/ (Markdown: https://insights.sbomify.com/CVE-2026-3453/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3453
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3453
- OSV: https://osv.dev/vulnerability/CVE-2026-3453

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-3453/
Summaries are generated and may contain mistakes; the official description above is the record.