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Vulnerability record · CVE-2026-28405 · published 5 March 2026

CVE-2026-28405: Markusproject markus cross-site scripting vulnerability

Markusproject · Markus

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.

5.4 CVSS 3.1 Medium EPSS 0.41% · top 67.2% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/MarkUsProject/Markus/commit/55d74f2ddb72d2ec2f29aa2b4cb6b2da10755036 Patch
https://github.com/MarkUsProject/Markus/releases/tag/v2.9.1 Release Notes
https://github.com/MarkUsProject/Markus/security/advisories/GHSA-p5pc-pxrj-3893 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.1CVE-2026-25057Markusproject markus relative path traversal vulnerabilityMarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, instructors are able to upload a zip file to creat…EPSS 0.48%7.1CVE-2024-51499Markusproject markus unrestricted file upload vulnerabilityMarkUs is a web application for the submission and grading of student assignments. In versions prior to 2.4.8, an arbitrary file write vulnerability …EPSS 0.72%7.1CVE-2024-51743Markusproject markus unrestricted file upload vulnerabilityMarkUs is a web application for the submission and grading of student assignments. In versions prior to 2.4.8, an arbitrary file write vulnerability …EPSS 0.74%6.5CVE-2026-25962Markusproject markus vulnerabilityMarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs currently extracts zip files withou…EPSS 0.45%6.5CVE-2026-24900Markusproject markus insecure direct object reference vulnerabilityMarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, the courses/<:course_id>/assignments/<:assignment_…EPSS 0.26%4.9CVE-2026-27807Markusproject markus vulnerabilityMarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs allows course instructors to upload…EPSS 0.47%3.5CVE-2024-47820Markusproject markus path traversal vulnerabilityMarkUs, a web application for the submission and grading of student assignments, is vulnerable to path traversal in versions prior to 2.4.8. Authenti…EPSS 0.75%6.1CVE-2026-42897Microsoft Exchange Server XSS enables spoofingMicrosoft Exchange Server and Exchange Server Subscription Edition fail to neutralize input during web page generation, a cross-site scripting flaw (…KEVEPSS 0.52%analysed

Source: NIST National Vulnerability Database (record CVE-2026-28405), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.