{"id":"CVE-2026-100523","summary":"Cotonti through 1.0.0 Open Redirect via message.php redirect parameter","details":"Cotonti through 1.0.0 contains an open redirect vulnerability in message.php that base64-decodes the redirect parameter without domain validation. Unauthenticated attackers can craft malicious links with encoded external URLs to redirect users to arbitrary sites via meta refresh tags for phishing attacks.","modified":"2026-09-27T03:47:23.733877015Z","published":"2026-09-26T00:59:24.331Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100523.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-601"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100523.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100523"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/cotonti-through-1.0.0-open-redirect-via-message-php-redirect-parameter"},{"type":"REPORT","url":"https://github.com/Cotonti/Cotonti/issues/1907"},{"type":"FIX","url":"https://github.com/Cotonti/Cotonti/pull/1908"},{"type":"PACKAGE","url":"https://github.com/Cotonti/Cotonti"},{"type":"ARTICLE","url":"https://github.com/Cotonti/Cotonti/blob/1.0.0/message.php"},{"type":"ARTICLE","url":"https://github.com/Cotonti/Cotonti/blob/1.0.0/system/common.php"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cotonti/cotonti","events":[{"introduced":"0"},{"fixed":"0d554e939a315e7f7f18fba3ca1132b80c6a1adb"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"1.0.0"},{"fixed":"1.0.0"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["0.9.25","0.9.24.2","0.9.24.1","0.9.24","0.9.23","0.9.22","0.9.21","0.9.20.1","0.9.20","0.9.19","0.9.19-rc1","0.9.19-RC.1","0.9.18.1","0.9.18","0.9.17","0.9.16.2","0.9.16.1","0.9.16","0.9.15","0.9.14","0.9.13","0.9.12.1","0.9.12","cotonti-0.9.11.1","cotonti-0.9.11","cotonti-0.9.10","cotonti-0.9.8","cotonti-0.9.7","cotonti-0.9.6","cotonti-0.9.3"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100523.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"}]}