{"schema":"threatline.record/2","record":{"id":"CVE-2026-101090","aliases":["GHSA-rf68-8gjr-36q7","GO-2026-6486"],"summary":"Nezha through 2.2.3 Host Header Injection via OAuth2 redirect_uri","details":"Nezha 2.2.3 contains a Host header injection regression in the OAuth2 redirect endpoint. When the new optional dashboard_host setting is empty, /api/v1/oauth2/{provider} (cmd/dashboard/controller/oauth2.go) reflects the attacker-supplied HTTP Host header into the redirect_uri sent to the identity provider instead of falling back to the configured install_host. An attacker who induces a victim to begin OAuth2 login via a request that reaches Nezha with a forged Host header can cause an attacker-controlled callback URL to be used as the redirect_uri; if the OAuth2 provider accepts it, the victim's authorization code is delivered to the attacker origin, allowing the attacker to complete the OAuth2 login/binding flow and take over the account. This regresses the fix for GHSA-9rc6-8cjv-rcvx and is configuration-dependent (dashboard_host empty). At the time of the advisory no patched version was available.","categories":["Libraries & packages"],"product":"nezha","vendor":"nezhahq","ecosystem":"Go","affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-101090","source_modified_at":"2026-09-28T13:00:01.476Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"nezha","vendor":"nezhahq","versions":[{"version":"2.2.3","status":"affected","versionType":"semver","lessThanOrEqual":"2.2.3"}],"defaultStatus":"unaffected"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-rf68-8gjr-36q7","source_modified_at":"2026-09-28T17:11:14.221598075Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"github.com/nezhahq/nezha","ecosystem":"Go","purl":"pkg:golang/github.com/nezhahq/nezha"},"ranges":[],"versions":["2.2.3"]}],"fixed_versions":[],"cvss":9.3,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00358,"percentile":0.28376,"score_date":"2026-10-23"},"published_at":"2026-09-27T20:50:00.857Z","modified_at":"2026-09-28T17:11:14.221598075Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-101090","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-28T13:00:01.476Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-rf68-8gjr-36q7","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-28T17:11:14.221598075Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-101090","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/nezhahq/nezha/security/advisories/GHSA-rf68-8gjr-36q7","tags":["exploit"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/nezha-through-2.2.3-host-header-injection-via-oauth2-redirect-uri","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"yes","technical_impact":"total","assessed_at":"2026-09-28T12:59:35.911184Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-09-28T17:11:14.221598075Z","content_hash":"a47dba3de226e1099013a4b88bbc71599ef9ae31c930952f1ce4acb4d8872abd"}}