CVE-2026-33661
8.6 · HIGHOverview
CVE-2026-33661 is a high-severity vulnerability affecting yansongda pay. It was published on March 26, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
Pay is an open-source payment SDK extension package for various Chinese payment services. Prior to version 3.7.20, the `verify_wechat_sign()` function in `src/Functions.php` unconditionally skips all signature verification when the PSR-7 request reports `localhost` as the host. An attacker can exploit this by sending a crafted HTTP request to the WeChat Pay callback endpoint with a `Host: localhost` 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.
Remediation
Check the references section for vendor advisories and patches from yansongda. Update pay to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| yansongda | pay | >= 0, < 3.7.20 | Affected |
Frequently Asked Questions
What is CVE-2026-33661?
CVE-2026-33661 is a high-severity vulnerability affecting yansongda pay. It was published on March 26, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).
How severe is CVE-2026-33661?
This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-33661?
Check the references section for vendor advisories and patches from yansongda. Update pay to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-33661?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-33661 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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