MEDIUMCVSS v3.1 6.5Vulnerability
CVE-2026-113603
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.
Properties
- Severity
- MEDIUM
- Nvd fetched at
- 2026-10-20T21:14:08.448323+00:00
- Cvss severity
- MEDIUM
- Cvss score
- 6.5
- Retrieved at
- 2026-10-20T21:15:35+00:00
- Score
- 6.5
- Cvss version
- 3.1
- Last source
- NVD
- Cve id
- CVE-2026-113603
- Cvss vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- First seen by Signal
- 2026-10-20T17:10:14+00:00
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Published at
- 2026-10-20T16:17:10.087
- Last modified
- 2026-10-20T20:06:37.150
Related Entities (1)
HAS_WEAKNESS (1)
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