CVE-2026-8406

High

Description

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.

SeverityHigh

CVSS7.1

Exploit probability—

ProductopenSIS-Classic

PublishedJun 11, 2026

First seenJun 11, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Patches

github.com/OS4ED/openSIS-Classic/commit/c45d43146167324bae06bdf09de3e4bd2e5e478f

Affected products

Product	Affected versions	Fixed in
OS4ED openSIS-Classic	9.3	—

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