CVE-2026-83537 WP Express Checkout < 2.5.0 - Unauthenticated Payment Bypass via wpec_process_empty_payment
Unauthenticated attackers can bypass payment verification in WP Express Checkout to mark orders as paid without actually paying.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-83537?
CVE-2026-83537 is a medium-severity vulnerability in Unknown WP Express Checkout, published on 9 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The WP Express Checkout WordPress plugin before 2.5.0 does not verify server-side that a payment was actually completed before marking an order as paid, allowing unauthenticated users to forge a completed order without paying.
Weakness: CWE-345
Which versions are affected by CVE-2026-83537?
How do I fix CVE-2026-83537?
No fix has been published for CVE-2026-83537 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-83537 being exploited?
There is no known exploitation of CVE-2026-83537 in the wild and no public exploit code.
Sources
Also known as GHSA-89f9-r4mq-rxxm.