Description
The x402 SIWX server extension in @x402/extensions 2.3.1 through 2.28.0, x402 PyPI 2.11.0 through 2.25.0, and Go module 2.16.0 through 2.28.0 contains an authorization bypass vulnerability that allows paying clients to unlock unpaid routes by supplying a mismatched PaymentPayload.resource URL. Attackers can pay for the cheapest SIWX-protected route while setting resource.url to an expensive route, then repeatedly access it using only a SIGN-IN-WITH-X header without further payment.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
x402-foundation @x402/extensions
Default version status: unaffected
2.3.1 to ≤ 2.28.0affected
pkg:npm/%40x402/extensionsx402-foundation x402
Default version status: unaffected
2.11.0 to ≤ 2.25.0affected
pkg:pypi/x402x402-foundation github.com/x402-foundation/x402/go/v2
Default version status: unaffected
2.16.0 to ≤ 2.28.0affected
pkg:golang/github.com/x402-foundation/x402/go/v2References
- https://github.com/x402-foundation/x402/issues/3838 ↗
- https://github.com/x402-foundation/x402/pull/3840 ↗
- https://github.com/x402-foundation/x402/blob/npm-@x402/extensions@v2.28.0/typescript/packages/extensions/src/sign-in-with-x/hooks.ts ↗
- https://github.com/x402-foundation/x402/blob/pypi-x402@v2.25.0/python/x402/extensions/sign_in_with_x/hooks.py ↗
- https://github.com/x402-foundation/x402/blob/go/v2.28.0/go/extensions/signinwithx/server.go ↗
- https://www.vulncheck.com/advisories/x402-x402-extensions-2.3.1-through-2.28.0-siwx-payment-bypass-via-paymentpayload-resource ↗