{"id":"CVE-2026-8406","summary":"openSIS Classic 9.3 - Insecure Direct Object Reference in Sent Mail","details":"openSIS Classic 9.3 contains an insecure direct object reference vulnerability in the messaging module. Any authenticated user with access to the messaging module can request sent-message details from modules/messaging/SentMail.php by supplying an arbitrary mail_id value.","modified":"2026-07-15T01:48:52.049224241Z","published":"2026-06-11T13:32:36.738Z","database_specific":{"cwe_ids":["CWE-639"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8406.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"9.3"},{"last_affected":"9.3"}]}],"cna_assigner":"Fluid Attacks"},"references":[{"type":"ADVISORY","url":"https://fluidattacks.com/es/advisories/melanie"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8406.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8406"},{"type":"FIX","url":"https://github.com/OS4ED/openSIS-Classic/commit/c45d43146167324bae06bdf09de3e4bd2e5e478f"},{"type":"PACKAGE","url":"https://github.com/OS4ED/openSIS-Classic"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/os4ed/opensis-classic","events":[{"introduced":"0"},{"fixed":"c45d43146167324bae06bdf09de3e4bd2e5e478f"}],"database_specific":{"source":"REFERENCES"}}],"versions":["V9.2","V9.1","V9.0","V8.0","V7.6","V7.5","ver7.4","v7.3","v7.2","ver7.1","v7.1","Ver7.0Prod_update","Ver7.0beta1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8406.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}