{"id":"CVE-2026-45286","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-45286","generatedAt":"2026-10-28T02:10:35.546Z","title":"Nextcloud is an open source content collaboration platform.","description":"Nextcloud is an open source content collaboration platform. From versions 5.5.13 to before 5.5.17, and 6.2.0 to before 6.2.3, an authenticated user can enumerate users on the same Nextcloud instance by using the Calendar app's endpoint for suggesting attendees. The sharing restrictions, applied to other endpoints, were not effective here. This issue has been patched in versions 5.5.17 and 6.2.3.","published":"2026-06-01T19:16:51.000Z","lastModified":"2026-07-22T08:10:00.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"},"cwe":["CWE-200"],"affected":["nextcloud/calendar"],"epss":{"score":0.00281,"percentile":0.20372,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.28%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/nextcloud/calendar/issues/7971","tags":["Exploit","Issue Tracking","Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/nextcloud/calendar/pull/8197","tags":["Issue Tracking","Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r697-74m9-gvf2","tags":["Mitigation","Vendor Advisory"],"source":"security-advisories@github.com"},{"url":"https://hackerone.com/reports/3540663","tags":["Permissions Required"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45286","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}