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2 vulnerabilities by yansongda
CVE-2026-33661 (GCVE-0-2026-33661)
Vulnerability from nvd – Published: 2026-03-26 21:05 – Updated: 2026-03-27 20:00
VLAI
EPSS
VEX
Title
WeChat Pay callback signature verification bypassed when Host header is localhost
Summary
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.
Severity
8.6 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-290 - Authentication Bypass by Spoofing
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/yansongda/pay/security/advisor… | x_refsource_CONFIRM |
| https://github.com/yansongda/pay/commit/26987ebf7… | x_refsource_MISC |
| https://github.com/yansongda/pay/releases/tag/v3.7.20 | x_refsource_MISC |
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CVE-2026-33661 (GCVE-0-2026-33661)
Vulnerability from cvelistv5 – Published: 2026-03-26 21:05 – Updated: 2026-03-27 20:00
VLAI
EPSS
VEX
Title
WeChat Pay callback signature verification bypassed when Host header is localhost
Summary
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.
Severity
8.6 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-290 - Authentication Bypass by Spoofing
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/yansongda/pay/security/advisor… | x_refsource_CONFIRM |
| https://github.com/yansongda/pay/commit/26987ebf7… | x_refsource_MISC |
| https://github.com/yansongda/pay/releases/tag/v3.7.20 | x_refsource_MISC |
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