{"cve":"CVE-2026-53523","nvd":{"published":"2026-06-12T22:16:52.523","modified":"2026-10-25T23:10:00.167","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","score":6.8},"cwes":["CWE-601"],"references":["https://github.com/nezhahq/nezha/security/advisories/GHSA-9rc6-8cjv-rcvx","https://github.com/nezhahq/nezha/security/advisories/GHSA-9rc6-8cjv-rcvx"],"products":[],"source":"nvd","synced_at":"2026-10-25T23:44:33.281319194+00:00"},"epss":{"cve":"CVE-2026-53523","score":0.00239,"percentile":0.14871,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-9rc6-8cjv-rcvx","url":"https://osv.dev/vulnerability/GHSA-9rc6-8cjv-rcvx","summary":"Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection","modified":"2026-07-07T16:11:15.913172487Z","packages":[{"ecosystem":"Go","name":"github.com/nezhahq/nezha","purl":"pkg:golang/github.com/nezhahq/nezha","ranges":[">=1.0.0 <2.2.0"],"fixed":["2.2.0"]}]},{"id":"GO-2026-5829","url":"https://osv.dev/vulnerability/GO-2026-5829","summary":"Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection in github.com/nezhahq/nezha","modified":"2026-07-07T16:00:21.965292344Z","packages":[{"ecosystem":"Go","name":"github.com/nezhahq/nezha","purl":"pkg:golang/github.com/nezhahq/nezha","ranges":[">=1.0.0"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}