# CVE-2026-17016: Restore PayPal Standard for WooCommerce <= 3.1.0 - Payment Bypass via PDT Underpayment

> Attackers can bypass payment validation to mark orders as paid while underpaying when the PayPal Data Transfer feature is enabled.

- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/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:** 10 Aug 2026
- **Updated:** 11 Aug 2026
- **Also known as:** GHSA-3gq9-83xc-rrc7

## What is CVE-2026-17016?

CVE-2026-17016 is a low-severity vulnerability in Unknown Accept PayPal & Stripe with Subscriptions for WooCommerce, published on 10 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Accept PayPal & Stripe with Subscriptions for WooCommerce WordPress plugin through 3.1.0 does not validate the amount actually paid against the order total in its PayPal Data Transfer return handler, allowing a customer to pay less than the order total and still have the order marked as fully paid when the PayPal Data Transfer feature is enabled.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-17016?


## How do I fix CVE-2026-17016?

No fix has been published for CVE-2026-17016 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-17016 being exploited?

There is no known exploitation of CVE-2026-17016 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-17016 and fix it if it is affected.

What it is: CVE-2026-17016 is a low-severity vulnerability in Unknown Accept PayPal & Stripe with Subscriptions for WooCommerce, published on 10 Aug 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-2026-17016 in the wild and no public exploit code.

Affected product: Unknown Accept PayPal & Stripe with Subscriptions for WooCommerce. 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-2026-17016/ (Markdown: https://insights.sbomify.com/CVE-2026-17016/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-17016
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-17016
- OSV: https://osv.dev/vulnerability/CVE-2026-17016

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-17016/
Summaries are generated and may contain mistakes; the official description above is the record.