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CVE-2026-8406— openSIS Classic 9.3 - Insecure Direct Object Reference in Sent Mail

Quick assessment

Affected
OS4ED openSIS-Classic
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

openSIS Classic是Open Solutions for Education开源的一个易于使用的学生信息系统。用于组织学生信息和学校相关操作，以提高 K-12、贸易学校和高等教育学校系统的效率。 openSIS Classic 9.3版本存在安全漏洞，该漏洞源于消息模块中存在不安全的直接对象引用，可能导致任何经过身份验证的用户通过提供任意mail_id值请求已发送消息详情。

AI Predicted 5.4 Difficulty: Easy EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
OS4ED openSIS-Classic 9.3 affected
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I. Basic Information for CVE-2026-8406

Vulnerability Information
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Vulnerability Title
openSIS Classic 9.3 - Insecure Direct Object Reference in Sent Mail
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
openSIS Classic 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
openSIS Classic是Open Solutions for Education开源的一个易于使用的学生信息系统。用于组织学生信息和学校相关操作，以提高 K-12、贸易学校和高等教育学校系统的效率。 openSIS Classic 9.3版本存在安全漏洞，该漏洞源于消息模块中存在不安全的直接对象引用，可能导致任何经过身份验证的用户通过提供任意mail_id值请求已发送消息详情。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OS4ED openSIS-Classic 9.3 -

II. Public POCs for CVE-2026-8406

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III. Intelligence Information for CVE-2026-8406

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Patches & Fixes for CVE-2026-8406 (1)

Vendor Advisories for CVE-2026-8406 (1)

IV. Related Vulnerabilities

Same product: openSIS-Classic
Same vendor: OS4ED
Same weakness: CWE-639

V. Comments for CVE-2026-8406

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