User Impersonation Affecting yansongda/pay package, versions <3.7.20
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-YANSONGDAPAY-15798278
- published28 Mar 2026
- disclosed25 Mar 2026
- creditUnknown
Introduced: 25 Mar 2026
CVE-2026-33661 (opens in a new tab)How to fix?
Upgrade yansongda/pay to version 3.7.20 or higher.
Overview
Affected versions of this package are vulnerable to User Impersonation via the verify_wechat_sign function. An attacker can cause unauthorized order status changes by sending a crafted HTTP request with a Host: localhost header, which bypasses signature verification and allows forging payment notifications.