CVE-2026-8406

openSIS Classic 9.3 - Insecure Direct Object Reference in Sent Mail

State: Published
Severity: 7.1 High
Published: Jun 11, 2026
Updated: Jun 11, 2026
Reserved: May 12, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	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	Fluid Attacks

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
openSIS-ClassicOS4ED	9.3Affected

References

https://fluidattacks.com/es/advisories/melaniethird-party-advisory
https://github.com/OS4ED/openSIS-Classic/commit/c45d43146167324bae06bdf09de3e4bd2e5e478fpatch
https://github.com/OS4ED/openSIS-Classicproduct

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