{"id":"CVE-2026-27589","state":"PUBLISHED","title":"Caddy vulnerable to cross-origin config application via local admin API /load (caddy)","description":"Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admin API (default listen `127.0.0.1:2019`) exposes a state-changing `POST /load` endpoint that replaces the entire running configuration. When origin enforcement is not enabled (`enforce_origin` not configured), the admin endpoint accepts cross-origin requests (e.g., from attacker-controlled web content in a victim browser) and applies an attacker-supplied JSON config. This can change the admin listener settings and alter HTTP server behavior without user intent. Version 2.11.1 contains a fix for the issue.","publishedAt":"2026-02-24T16:30:52.016Z","updatedAt":"2026-02-27T20:51:24.110Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P","source":"GitHub_M"},"assigner":"GitHub_M","products":["caddyserver caddy"],"affected":[{"vendor":"caddyserver","product":"caddy","versions":[{"version":"< 2.11.1","status":"affected"}]}],"references":["https://github.com/caddyserver/caddy/security/advisories/GHSA-879p-475x-rqh2","https://github.com/caddyserver/caddy/releases/tag/v2.11.1","https://github.com/user-attachments/files/25079818/poc.zip","https://github.com/user-attachments/files/25079820/PR_DESCRIPTION.md"],"weaknesses":["CWE-352"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/27xxx/CVE-2026-27589.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27589","state":"PUBLISHED","datePublished":"2026-02-24T16:30:52.016Z","dateUpdated":"2026-02-27T20:51:24.110Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-20T17:40:28.450Z"},"containers":{"cna":{"title":"Caddy vulnerable to cross-origin config application via local admin API /load (caddy)","descriptions":[{"lang":"en","value":"Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admin API (default listen `127.0.0.1:2019`) exposes a state-changing `POST /load` endpoint that replaces the entire running configuration. When origin enforcement is not enabled (`enforce_origin` not configured), the admin endpoint accepts cross-origin requests (e.g., from attacker-controlled web content in a victim browser) and applies an attacker-supplied JSON config. This can change the admin listener settings and alter HTTP server behavior without user intent. Version 2.11.1 contains a fix for the issue."}],"affected":[{"vendor":"caddyserver","product":"caddy","versions":[{"version":"< 2.11.1","status":"affected"}]}],"references":[{"url":"https://github.com/caddyserver/caddy/security/advisories/GHSA-879p-475x-rqh2","name":"https://github.com/caddyserver/caddy/security/advisories/GHSA-879p-475x-rqh2","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/caddyserver/caddy/releases/tag/v2.11.1","name":"https://github.com/caddyserver/caddy/releases/tag/v2.11.1","tags":["x_refsource_MISC"]},{"url":"https://github.com/user-attachments/files/25079818/poc.zip","name":"https://github.com/user-attachments/files/25079818/poc.zip","tags":["x_refsource_MISC"]},{"url":"https://github.com/user-attachments/files/25079820/PR_DESCRIPTION.md","name":"https://github.com/user-attachments/files/25079820/PR_DESCRIPTION.md","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-352","lang":"en","description":"CWE-352: Cross-Site Request Forgery (CSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-02-24T16:31:35.510Z"},"source":{"advisory":"GHSA-879p-475x-rqh2","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-27T20:51:17.015647Z","id":"CVE-2026-27589","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-27T20:51:24.110Z"}}]}}}