CVE-2026-8406

HIGH

openSIS Classic 9.3 - Insecure Direct Object Reference in Sent Mail

Title source: cna
STIX 2.1

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 (3)

Core 3

Scores

CVSS v4 7.1
EPSS 0.0024
EPSS Percentile 14.6%
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-639
Status published
Products (1)
OS4ED/openSIS-Classic 9.3
Published Jun 11, 2026
Tracked Since Jun 11, 2026