Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection_CVE-2026-53523

{
    "lastseen": "",
    "description": "Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.0.0 to before version 2.2.0, the getRedirectURL function in oauth2.go:22-29 constructs the OAuth2 callback URL by concatenating the request's Host header with a fixed path, with zero validation of the Host header. This can result in host header injection. This issue has been patched in version 2.2.0.",
    "published": "2026-06-12T21:04:46.741Z",
    "modified": "2026-06-12T21:04:46.741Z",
    "type": "cve",
    "title": "Nezha Monitoring: OAuth2 Redirect URL \u2014 Host Header Injection",
    "source": "GitHub_M",
    "references": "https://github.com/nezhahq/nezha/security/advisories/GHSA-9rc6-8cjv-rcvx",
    "id": "CVE-2026-53523",
    "bulletinFamily": "",
    "cwe": [
        "CWE-601"
    ],
    "cvelist": null,
    "sourceData": "nezhahq nezha >= 1.0.0, < 2.2.0",
    "sourceHref": "",
    "cvss": {
        "score": 6.8,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "nezha",
    "version": ">= 1.0.0, < 2.2.0",
    "vendor": "nezhahq",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
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    "ai_score": 0
}