CVE-2026-8406 HIGH

CVE-2026-8406: openSIS Classic 9.3 - Insecure Direct Object Reference in Sent Mail

Vendor Os4Ed
Product openSIS-Classic
Weakness CWE-639 · IDOR
Published June 11, 2026
Last update June 11, 2026
View on NVD All CVEs

CVSS base score

7.1/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 11, 2026 CVE published
June 11, 2026 Record updated