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CVE-2026-33661

8.6 · HIGH

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

Published Mar 26, 2026CWE-290EPSS 0.67%

Overview

CVE-2026-33661 is a high-severity vulnerability. 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, patches, and mitigation guidance. 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.

References

GitHubgithub.com/yansongda/pay/commit/26987ebf789f1e7f0a85febb640986ab4289fd7fGitHubgithub.com/yansongda/pay/releases/tag/v3.7.20GitHubgithub.com/yansongda/pay/security/advisories/GHSA-q938-ghwv-8gvcGitHubgithub.com/yansongda/pay/security/advisories/GHSA-q938-ghwv-8gvc

How CyberStrike helps

Frequently asked questions

What is CVE-2026-33661?

CVE-2026-33661 is a high-severity vulnerability. 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, patches, and mitigation guidance. 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 is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-33661 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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