CVE-2026-8406

openSIS Classic 9.3 - Insecure Direct Object Reference in Sent Mail

CVSS 7.1 HIGHEPSS 0.2%CWE-639

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.1EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

11 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

OS4ED · openSIS-Classic

References

https://fluidattacks.com/es/advisories/melanie https://github.com/OS4ED/openSIS-Classic https://github.com/OS4ED/openSIS-Classic/commit/c45d43146167324bae06bdf09de3e4bd2e5e478f