CVE-2026-8406

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.

References

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