{"id":"CVE-2026-52840","state":"PUBLISHED","title":"Easy!Appointments has server-side request forgery in CalDAV connection test that exposes the deployment's internal network","description":"Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, `Caldav::connect_to_server` at `application/controllers/Caldav.php:60` hands the request's `caldav_url` to a Guzzle `REPORT` call without scheme or host validation. A logged-in backend user (admin, provider, or secretary) reaches loopback, RFC1918, and link-local hosts on the deployment's network. The Guzzle exception path returns the upstream status code plus ~120 bytes of response body in the JSON `message` field (`Caldav.php:74-78`), so the SSRF is semi-blind. Version 1.6.0 contains a patch.","publishedAt":"2026-07-14T15:23:59.992Z","updatedAt":"2026-07-15T13:53:09.948Z","severity":{"score":2.7,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["alextselegidis easyappointments"],"affected":[{"vendor":"alextselegidis","product":"easyappointments","versions":[{"version":"< 1.6.0","status":"affected"}]}],"references":["https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-pm5p-7w5h-jm5q","https://github.com/alextselegidis/easyappointments/commit/6eb9336a91cfb276379506625e81f5bd9ed3a536"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/52xxx/CVE-2026-52840.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-52840","state":"PUBLISHED","datePublished":"2026-07-14T15:23:59.992Z","dateUpdated":"2026-07-15T13:53:09.948Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-08T18:41:27.724Z"},"containers":{"cna":{"title":"Easy!Appointments has server-side request forgery in CalDAV connection test that exposes the deployment's internal network","descriptions":[{"lang":"en","value":"Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, `Caldav::connect_to_server` at `application/controllers/Caldav.php:60` hands the request's `caldav_url` to a Guzzle `REPORT` call without scheme or host validation. A logged-in backend user (admin, provider, or secretary) reaches loopback, RFC1918, and link-local hosts on the deployment's network. The Guzzle exception path returns the upstream status code plus ~120 bytes of response body in the JSON `message` field (`Caldav.php:74-78`), so the SSRF is semi-blind. Version 1.6.0 contains a patch."}],"affected":[{"vendor":"alextselegidis","product":"easyappointments","versions":[{"version":"< 1.6.0","status":"affected"}]}],"references":[{"url":"https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-pm5p-7w5h-jm5q","name":"https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-pm5p-7w5h-jm5q","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/alextselegidis/easyappointments/commit/6eb9336a91cfb276379506625e81f5bd9ed3a536","name":"https://github.com/alextselegidis/easyappointments/commit/6eb9336a91cfb276379506625e81f5bd9ed3a536","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":2.7,"baseSeverity":"LOW","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-14T15:23:59.992Z"},"source":{"advisory":"GHSA-pm5p-7w5h-jm5q","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-pm5p-7w5h-jm5q","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-15T13:53:03.540827Z","id":"CVE-2026-52840","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":"2026-07-15T13:53:09.948Z"}}]}}}