Package Instance
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{ "url": "http://public2.vulnerablecode.io/api/packages/993327?format=api", "purl": "pkg:composer/yansongda/pay@2.6.0-beta", "type": "composer", "namespace": "yansongda", "name": "pay", "version": "2.6.0-beta", "qualifiers": {}, "subpath": "", "is_vulnerable": true, "next_non_vulnerable_version": "3.7.20", "latest_non_vulnerable_version": "3.7.20", "affected_by_vulnerabilities": [ { "url": "http://public2.vulnerablecode.io/api/vulnerabilities/91620?format=api", "vulnerability_id": "VCID-d7j9-ubqn-wkhf", "summary": "WeChat Pay callback signature verification bypassed when Host header is localhost\n## Summary\n\nThe `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.\n\nThis allows forging fake WeChat Pay payment success notifications, potentially causing applications to mark orders as paid without actual payment.\n\n## Vulnerable Code\n\n**`src/Functions.php` lines 243-246:**\n```php\nfunction verify_wechat_sign(ResponseInterface|ServerRequestInterface $message, array $params): void\n{\n // BYPASS: Returns without any signature check if Host header is localhost\n if ($message instanceof ServerRequestInterface && 'localhost' === $message->getUri()->getHost()) {\n return; // No signature verified!\n }\n\n // ... openssl_verify() only reached when Host != localhost\n $wechatSerial = $message->getHeaderLine('Wechatpay-Serial');\n $sign = $message->getHeaderLine('Wechatpay-Signature');\n $result = 1 === openssl_verify($content, base64_decode($sign), $public, 'sha256WithRSAEncryption');\n}\n```\n\nIn PSR-7 implementations (Nyholm, Guzzle PSR-7, etc.), `$request->getUri()->getHost()` reads the `Host` HTTP header, which is fully attacker-controlled.\n\n## Proof of Concept\n\n```bash\ncurl -X POST https://merchant.example.com/payment/wechat/callback \\\n -H \"Host: localhost\" \\\n -H \"Content-Type: application/json\" \\\n -H \"Wechatpay-Serial: any\" \\\n -H \"Wechatpay-Timestamp: 1234567890\" \\\n -H \"Wechatpay-Nonce: abc\" \\\n -H \"Wechatpay-Signature: AAAA\" \\\n -d '{\"id\":\"fake-order\",\"event_type\":\"TRANSACTION.SUCCESS\"}'\n```\n\n`verify_wechat_sign()` returns immediately without verifying the signature. The application marks the order as paid.\n\n## Impact\n\n- **Payment fraud**: Attacker receives goods/services without actual payment by forging WeChat Pay callbacks\n- **No authentication required**: Pure network attack, zero privileges needed\n- **Wide reach**: Affects any application using `yansongda/pay` for WeChat Pay callback validation. However, in most environments, Nginx/Ingress/Cloudflare/WAF will directly reject the forgery of this request header, so there is no need to worry too much.", "references": [ { "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2026-33661", "reference_id": "", "reference_type": "", "scores": [ { "value": "0.00016", "scoring_system": "epss", "scoring_elements": "0.0372", "published_at": "2026-06-06T12:55:00Z" }, { "value": "0.00016", "scoring_system": "epss", "scoring_elements": "0.03698", "published_at": "2026-06-09T12:55:00Z" }, { "value": "0.00016", "scoring_system": "epss", "scoring_elements": "0.03687", "published_at": "2026-06-08T12:55:00Z" }, { "value": "0.00016", "scoring_system": "epss", "scoring_elements": "0.03711", "published_at": "2026-06-07T12:55:00Z" }, { "value": "0.00016", "scoring_system": "epss", "scoring_elements": "0.03717", "published_at": "2026-06-05T12:55:00Z" } ], "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-33661" }, { "reference_url": "https://github.com/yansongda/pay", "reference_id": "", "reference_type": "", "scores": [ { "value": "8.6", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://github.com/yansongda/pay" }, { "reference_url": "https://github.com/yansongda/pay/commit/26987ebf789f1e7f0a85febb640986ab4289fd7f", "reference_id": "", "reference_type": "", "scores": [ { "value": "8.6", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-27T14:12:47Z/" } ], "url": "https://github.com/yansongda/pay/commit/26987ebf789f1e7f0a85febb640986ab4289fd7f" }, { "reference_url": "https://github.com/yansongda/pay/releases/tag/v3.7.20", "reference_id": "", "reference_type": "", "scores": [ { "value": "8.6", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-27T14:12:47Z/" } ], "url": "https://github.com/yansongda/pay/releases/tag/v3.7.20" }, { "reference_url": "https://github.com/yansongda/pay/security/advisories/GHSA-q938-ghwv-8gvc", "reference_id": "", "reference_type": "", "scores": [ { "value": "8.6", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N" }, { "value": "HIGH", "scoring_system": "cvssv3.1_qr", "scoring_elements": "" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-27T14:12:47Z/" } ], "url": "https://github.com/yansongda/pay/security/advisories/GHSA-q938-ghwv-8gvc" }, { "reference_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33661", "reference_id": "", "reference_type": "", "scores": [ { "value": "8.6", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N" }, { "value": "HIGH", "scoring_system": "generic_textual", "scoring_elements": "" } ], "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33661" }, { "reference_url": "https://github.com/advisories/GHSA-q938-ghwv-8gvc", "reference_id": "GHSA-q938-ghwv-8gvc", "reference_type": "", "scores": [ { "value": "HIGH", "scoring_system": "cvssv3.1_qr", "scoring_elements": "" } ], "url": "https://github.com/advisories/GHSA-q938-ghwv-8gvc" } ], "fixed_packages": [ { "url": "http://public2.vulnerablecode.io/api/packages/113935?format=api", "purl": "pkg:composer/yansongda/pay@3.7.20", "is_vulnerable": false, "affected_by_vulnerabilities": [], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:composer/yansongda/pay@3.7.20" } ], "aliases": [ "CVE-2026-33661", "GHSA-q938-ghwv-8gvc" ], "risk_score": 4.0, "exploitability": "0.5", "weighted_severity": "8.0", "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-d7j9-ubqn-wkhf" } ], "fixing_vulnerabilities": [], "risk_score": "4.0", "resource_url": "http://public2.vulnerablecode.io/packages/pkg:composer/yansongda/pay@2.6.0-beta" }