CVE-2026-90987: CWE-472 External Control of Assumed-Immutable Web Parameter in Easy PayPal & Stripe Buy Now Button
The Easy PayPal & Stripe Buy Now Button WordPress plugin before 2.0.6 does not derive the payment amount on the server, taking it from a client-supplied field, so an unauthenticated attacker sets an arbitrary lower price for a purchase.
AI Analysis
Technical Summary
The Easy PayPal & Stripe Buy Now Button WordPress plugin before version 2.0.6 suffers from an external control of an assumed-immutable web parameter (CWE-472). Specifically, the payment amount is not derived or validated on the server side but taken directly from a client-supplied field. This flaw enables an unauthenticated attacker to manipulate the payment amount to a lower value, undermining the integrity of the purchase process.
Potential Impact
An attacker can reduce the payment amount for a purchase by manipulating the client-supplied payment amount parameter. This compromises the integrity of transactions by allowing unauthorized price modifications. There is no impact on confidentiality or availability reported. The vulnerability has a CVSS 3.1 base score of 5.3 (medium severity), indicating limited impact primarily on transaction integrity.
Mitigation Recommendations
A fixed version 2.0.6 or later is available that addresses this issue by properly deriving the payment amount on the server side. Users of affected versions (>=1.8 <2.0.6) should upgrade to version 2.0.6 or later to remediate this vulnerability. No other mitigation steps are indicated.
CVE-2026-90987: CWE-472 External Control of Assumed-Immutable Web Parameter in Easy PayPal & Stripe Buy Now Button
Description
The Easy PayPal & Stripe Buy Now Button WordPress plugin before 2.0.6 does not derive the payment amount on the server, taking it from a client-supplied field, so an unauthenticated attacker sets an arbitrary lower price for a purchase.
CVSS v3.1
Score 5.3medium
Affected software
Easy PayPal & Stripe Buy Now Button
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Easy PayPal & Stripe Buy Now Button WordPress plugin before version 2.0.6 suffers from an external control of an assumed-immutable web parameter (CWE-472). Specifically, the payment amount is not derived or validated on the server side but taken directly from a client-supplied field. This flaw enables an unauthenticated attacker to manipulate the payment amount to a lower value, undermining the integrity of the purchase process.
Potential Impact
An attacker can reduce the payment amount for a purchase by manipulating the client-supplied payment amount parameter. This compromises the integrity of transactions by allowing unauthorized price modifications. There is no impact on confidentiality or availability reported. The vulnerability has a CVSS 3.1 base score of 5.3 (medium severity), indicating limited impact primarily on transaction integrity.
Mitigation Recommendations
A fixed version 2.0.6 or later is available that addresses this issue by properly deriving the payment amount on the server side. Users of affected versions (>=1.8 <2.0.6) should upgrade to version 2.0.6 or later to remediate this vulnerability. No other mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-14T13:55:59.930Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6abf8f57a43b0b3b89ac0adc
Added to database: 10/02/2026, 11:02:47 UTC
Last enriched: 10/02/2026, 11:16:51 UTC
Last updated: 10/03/2026, 03:50:42 UTC
Views: 14
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