CVE-2026-28405— MarkUs: Stored XSS in Submission HTML Preview Enables Instructor-Context Actions
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I. Basic Information for CVE-2026-28405
Vulnerability Information
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Vulnerability Title
MarkUs: Stored XSS in Submission HTML Preview Enables Instructor-Context Actions
Source: NVD (National Vulnerability Database)
Vulnerability Description
MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.1, the courses/<:course_id>/assignments/<:assignment_id>/submissions/html_content route reads the contents of a student-submitted file and renders them without sanitization. This issue has been patched in version 2.9.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
MarkUs 跨站脚本漏洞
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之前版本存在跨站脚本漏洞，该漏洞源于读取和渲染学生提交的文件内容时未进行清理。
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-2026-28405
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|---|
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IV. Related Vulnerabilities
Same product: Markus
- CVE-2026-25962
MarkUs: Zip bomb in config upload enables DoS - CVE-2026-27807
MarkUs: YAML alias (‘billion laughs’) DoS in config upload - CVE-2026-25057
Zip Slip in MarkUs config upload allowing RCE - CVE-2026-24900
MarkUs has a submission-view IDOR exposes all student submis - CVE-2024-51743
Arbitrary File Write leading up to remote code execution (in
Same vendor: MarkUsProject
- CVE-2026-25962
MarkUs: Zip bomb in config upload enables DoS - CVE-2026-27807
MarkUs: YAML alias (‘billion laughs’) DoS in config upload - CVE-2026-25057
Zip Slip in MarkUs config upload allowing RCE - CVE-2026-24900
MarkUs has a submission-view IDOR exposes all student submis - CVE-2024-51743
Arbitrary File Write leading up to remote code execution (in
Same weakness: CWE-79
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V. Comments for CVE-2026-28405
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