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CVE-2026-8406

openSIS Classic 9.3 - Insecure Direct Object Reference in Sent Mail

HIGH
7.1
CVSS Score
Published: June 11, 2026 at 01:32 PM UTC
Updated: October 26, 2026 at 11:10 AM UTC
1 product affected across 1 vendorOpensis

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Severity
HIGH7.1
Exploit prediction
EPSS 0.3%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Third Party Advisory
Source: cverecord
https://fluidattacks.com/es/advisories/melanie
Patch
Source: cverecord
https://github.com/OS4ED/openSIS-Classic/commit/c45d43146167324bae06bdf09de3e4bd2e5e478f
Product
Source: cverecord
https://github.com/OS4ED/openSIS-Classic

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHFluid Attacks
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-639

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