{"id":"CVE-2026-53523","sourceIdentifier":"security-advisories@github.com","published":"2026-06-12T22:16:52.523","lastModified":"2026-06-17T10:57:57.843","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"nezhahq","product":"nezha","versions":[{"version":">= 1.0.0, < 2.2.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","baseScore":6.8,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":1.6,"impactScore":5.2}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-06-15T21:35:11.641888Z","id":"CVE-2026-53523","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-601"}]}],"references":[{"url":"https://github.com/nezhahq/nezha/security/advisories/GHSA-9rc6-8cjv-rcvx","source":"security-advisories@github.com"},{"url":"https://github.com/nezhahq/nezha/security/advisories/GHSA-9rc6-8cjv-rcvx","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}