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Findings

CVE-2026-33661

Pay is an open-source payment SDK extension package for various Chinese payment services.

Published Mar 26, 2026 · updated Jun 17, 2026 · yansongda pay

Pay is an open-source payment SDK extension package for various Chinese payment services. Prior to version 3.7.20, the function in unconditionally skips all signature verification when the PSR-7 request reports as the host. An attacker can exploit this by sending a crafted HTTP request to the WeChat Pay callback endpoint with a header, bypassing the RSA signature check entirely. This allows forging fake WeChat Pay payment success notifications, potentially causing applications to mark orders as paid without actual payment. Version 3.7.20 fixes the issue.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 26, 2026 · NIST NVD

    Detected

    Pay is an open-source payment SDK extension package for various Chinese payment services. Prior to version 3.7.20, the function in unconditionally skips all signature verification when the PSR-7 request reports as the host. An attacker can exploit this by sending a crafted HTTP request to the WeChat Pay callback endpoint with a header, bypassing the RSA signature check entirely. This allows forgin

  2. Jun 17, 2026 · NIST NVD

    Updated

    Pay is an open-source payment SDK extension package for various Chinese payment services. Prior to version 3.7.20, the function in unconditionally skips all signature verification when the PSR-7 request reports as the host. An attacker can exploit this by sending a crafted HTTP request to the WeChat Pay callback endpoint with a header, bypassing the RSA signature check entirely. This allows forgin

Affected

  • cpe yansongda/payversion unspecified

Sources

  • CVE.orgVulnerability recordCVE-2026-33661

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-33661

    Pay is an open-source payment SDK extension package for various Chinese payment services. Prior to version 3.7.20, the function in unconditionally skips all signature verification when the PSR-7 request reports as the host. A

    nvd.nist.gov

References