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Paddle webhook vulnerability: Custom data trusted over transaction facts

By PulseAugur Editorial · [1 sources] ·

A security vulnerability was discovered in how Paddle webhooks were handled, where a system incorrectly trusted custom data fields over actual transaction details. The issue arose because the webhook signature verified the authenticity of the data, but not the accuracy of the data itself. Specifically, a handler confused a `seats` value within `customData` with the actual billed quantity from the `items` array, leading to incorrect seat grants. The recommended fix involves using custom data for correlation rather than authority, ensuring that entitlements are derived from the paid line items and tenant authorization is handled separately. AI

RANK_REASON The article describes a specific implementation vulnerability and its fix related to a payment processing service, rather than a new product release or major industry shift.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Paddle webhook vulnerability: Custom data trusted over transaction facts

How we ranked this

Signal score
4 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
The article describes a specific implementation vulnerability and its fix related to a payment processing service, rather than a new product release or major industry shift.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
product, safety
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Low
Off-topic or adjacent — cluster remains reachable but doesn't surface in AI-industry rankings.
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Breaking (< 6h)
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Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · FetchSandbox ·

    Your Paddle Webhook Is Signed. The Seat Count Is Not.

    <p>The webhook passed signature verification. Paddle said the transaction was complete. The customer paid for 5 seats.</p> <p>The database granted 500.</p> <p>Nothing forged the webhook. The dangerous value had entered earlier, through <code>customData</code> in browser checkout …

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