8.6
CVE-2026-33661
- EPSS 0.5%
- Veröffentlicht 26.03.2026 21:05:22
- Zuletzt bearbeitet 01.04.2026 13:47:23
- Quelle security-advisories@github.com
- CVE-Watchlists
- Unerledigt
LoginWeChat Pay callback signature verification bypassed when Host header is localhost
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.
| Typ | Quelle | Score | Percentile |
|---|---|---|---|
| EPSS | FIRST.org | 0.5% | 0.389 |
| Quelle | Base Score | Exploit Score | Impact Score | Vector String |
|---|---|---|---|---|
| nvd@nist.gov | 7.5 | 3.9 | 3.6 |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
|
| security-advisories@github.com | 8.6 | 3.9 | 4 |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
|
CWE-290 Authentication Bypass by Spoofing
This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.
https://github.com/yansongda/pay/security/advisories/GHSA-q938-ghwv-8gvc
https://github.com/yansongda/pay/commit/26987ebf789f1e7f0a85febb640986ab4289fd7f
https://github.com/yansongda/pay/releases/tag/v3.7.20