CVE-2026-24900— MarkUs has a submission-view IDOR exposes all student submissions
Quick assessment
Affected
MarkUsProject Markus
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.
MarkUs是MarkUs开源的一个 Ruby on Rails 和 React web 应用程序，用于提交和评分学生作业。 MarkUs 2.9.1之前版本存在安全漏洞，该漏洞源于参数未正确限定范围，可能导致访问任意提交文件内容。
Possible ATT&CK Techniques 1 AI
T1005 · Data from Local System
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I. Basic Information for CVE-2026-24900
Vulnerability Information
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Vulnerability Title
MarkUs has a submission-view IDOR exposes all student submissions
Source: CVE Program / CVE List V5
Vulnerability Description
MarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, the courses/<:course_id>/assignments/<:assignment_id>/submissions/html_content accepted a select_file_id parameter to serve SubmissionFile objects containing a record of files submitted by students. This parameter was not correctly scoped to the requesting user, allowing users access arbitrary submission file contents by id. This vulnerability is fixed in 2.9.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A: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
MarkUs 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MarkUs是MarkUs开源的一个 Ruby on Rails 和 React web 应用程序，用于提交和评分学生作业。 MarkUs 2.9.1之前版本存在安全漏洞，该漏洞源于参数未正确限定范围，可能导致访问任意提交文件内容。
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 |
|---|---|---|---|---|
| MarkUsProject | Markus | < 2.9.1 | - |
|
II. Public POCs for CVE-2026-24900
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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CVE-2026-25962
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Zip Slip in MarkUs config upload allowing RCE -
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V. Comments for CVE-2026-24900
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