{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-113603 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-113603 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-113603 is a medium-severity vulnerability in x402-foundation @x402/extensions, published on 20 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-113603 and fix it if it is affected.\n\nWhat it is: CVE-2026-113603 is a medium-severity vulnerability in x402-foundation @x402/extensions, published on 20 Oct 2026. \nExploitation: There is no known exploitation of CVE-2026-113603 in the wild and no public exploit code.\n\nAffected product: x402-foundation @x402/extensions. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-113603/ (Markdown: https://insights.sbomify.com/CVE-2026-113603/index.md)","id":"CVE-2026-113603","markdown":"https://insights.sbomify.com/CVE-2026-113603/index.md","name":"CVE-2026-113603","record":{"aliases":["GHSA-vxw2-vmfp-vrg3"],"analysis":null,"analysis_generated_by":null,"assigner":"VulnCheck","cpe":[],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key"}],"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"x402 @x402/extensions 2.3.1 through 2.28.0 SIWX Payment Bypass via PaymentPayload.resource","id":"CVE-2026-113603","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":6,"next":{"headline":"Ghidra 10.2 through 12.1.4 Denial of Service via ELF Loader Extended Header Counts","id":"CVE-2026-113604"},"packages":[],"prev":{"headline":"json-smart through 2.6.0 Strict-Mode Validation Bypass via 0x1A Character","id":"CVE-2026-113602"},"products":["@x402/extensions","github.com/x402-foundation/x402/go/v2","x402"],"published":"2026-10-20","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-21","vendors":["x402-foundation"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-113603/"}