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  4. CVE 2026 113603 x402 x402extensions 231 through 2280 siwx payment
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Back to active CVEs
Medium · CVSS 6.9CVE-2026-113603

x402 @x402/extensions 2.3.1 through 2.28.0 SIWX Payment Bypass via PaymentPayload.resourceCVE-2026-113603

Answer in brief

CVE-2026-113603 records a Medium severity (CVSS 6.9) vulnerability in x402 @x402/extensions 2.3.1 through 2.28.0 SIWX Payment Bypass via PaymentPayload.resource. The current sources do not mark it as known exploited. The current feed maps x402-foundation/github.com/x402-foundation/x402/go/v2 (generic), x402-foundation/x402 (generic), x402-foundation/@x402/extensions (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 20, 2026Updated Oct 20, 2026Source checked Oct 20, 2026First seen by HOL Oct 20, 2026Material review Oct 20, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.9
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps x402-foundation/github.com/x402-foundation/x402/go/v2 (generic), x402-foundation/x402 (generic), x402-foundation/@x402/extensions (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
x402-foundation/github.com/x402-foundation/x402/go/v2generic>=2.16.0 <=2.28.0Not reported
x402-foundation/x402generic>=2.11.0 <=2.25.0Not reported
x402-foundation/@x402/extensionsgeneric>=2.3.1 <=2.28.0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for x402-foundation/github.com/x402-foundation/x402/go/v2, x402-foundation/x402, x402-foundation/@x402/extensions.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Oct 20, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 20, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 20, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Stirling-PDF 3.0.0 through 3.2.0 Authorization Bypass via Processing FoldersAlso CWE-639
  • Xen Orchestra before 6.9.0 Authorization Bypass via user.set APIAlso CWE-639
  • ApostropheCMS: Same-parent page reorder in @apostrophecms/page move() re-ranks a restricted parent's children without create authorizationAlso CWE-639
  • ApostropheCMS: Missing Authorization on Notification PATCH/DELETE EndpointsAlso CWE-639
  • Cross-organization user modification and deletion via the SCIM API in Grafana EnterpriseAlso CWE-639

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-639
Source
CVE List V5
Source checked
Oct 20, 2026
References
6 linked sources
Open source record