{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-8406: openSIS Classic 9.3 - Insecure Direct Object Reference in Sent Mail","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-8406","status":"final","version":"1","initial_release_date":"2026-06-11T13:32:36.738Z","current_release_date":"2026-06-11T14:28:42.669Z","revision_history":[{"date":"2026-06-11T13:32:36.738Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-8406 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-8406"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-8406"},{"category":"external","summary":"fluidattacks.com","url":"https://fluidattacks.com/es/advisories/melanie"},{"category":"external","summary":"github.com","url":"https://github.com/OS4ED/openSIS-Classic/commit/c45d43146167324bae06bdf09de3e4bd2e5e478f"},{"category":"external","summary":"github.com","url":"https://github.com/OS4ED/openSIS-Classic"}]},"product_tree":{"branches":[{"category":"vendor","name":"OS4ED","branches":[{"category":"product_name","name":"openSIS-Classic","branches":[{"category":"product_version","name":"9.3","product":{"name":"OS4ED openSIS-Classic 9.3","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:os4ed:opensis-classic:9.3:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-8406","title":"openSIS Classic 9.3 - Insecure Direct Object Reference in Sent Mail","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"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","baseScore":7.1,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}