Unauthenticated payment amount manipulation via unchecked intent ownership
Published Aug 6, 2026 · Updated Aug 6, 2026
Missing authorization in Stripe Payment Forms by WP Full Pay before 8.5.2 allows remote attackers to change another PaymentIntent amount. The wpfs-calculate-pricing and wpfs-update-payment-intent actions accept an attacker-supplied stripePaymentIntentId without checking ownership, then update it through Stripe with the store's secret key. A public form supplies the required nonce; exploitation still requires another payment intent's identifier and can alter its payable amount.
Summary
What happened
Missing authorization in Stripe Payment Forms by WP Full Pay before 8.5.2 allows remote attackers to change another PaymentIntent amount. The wpfs-calculate-pricing and wpfs-update-payment-intent actions accept an attacker-supplied stripePaymentIntentId without checking ownership, then update it through Stripe with the store's secret key. A public form supplies the required nonce; exploitation still requires another payment intent's identifier and can alter its payable amount.
The record
- CVE
- CVE-2026-16734
- Published
- Aug 6, 2026
- Updated
- Aug 6, 2026
- Vendor
- Query Solutions Ltd.
- Product
- WP Full Pay
- Classifications
- CWE-862, T1565.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 6, 2026CVE publishedPublication date reported by the CVE source.
- Aug 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <8.5.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- WPScan payment-intent amount manipulation proof of conceptfunctional · validated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo