CVE-2026-16734 Stripe Payment Forms by WP Full Pay < 8.5.2 - Unauthenticated Payment Intent Amount Manipulation
Unauthenticated attackers can manipulate payment intent amounts via unprotected AJAX actions, leading to unauthorized price changes.
- 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-2026-16734?
CVE-2026-16734 is a high-severity vulnerability in Unknown Stripe Payment Forms by WP Full Pay, published on 6 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Stripe Payment Forms by WP Full Pay WordPress plugin before 8.5.2 does not verify that the caller owns the Stripe payment intent referenced by two unauthenticated payment-form AJAX actions, allowing an unauthenticated visitor — using a nonce that is embedded in every public page containing a payment form — to change the amount of a payment intent that the Stripe Payment Forms by WP Full Pay WordPress plugin before 8.5.2 then updates server-side through the Stripe API with the store's secret key. An ownership check added in 8.5.0 was applied to only one payment-intent handler, leaving the pricing-recalculation and payment-intent-update actions unprotected against amount manipulation.
Weakness: CWE-862
Which versions are affected by CVE-2026-16734?
How do I fix CVE-2026-16734?
No fix has been published for CVE-2026-16734 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-16734 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16734 exists.
Sources
Also known as GHSA-8673-2q96-2vmf.