CVE-2026-28405

HIGH
2026-03-05 [email protected]
8.0
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 22:06 vuln.today
Patch Released
Mar 10, 2026 - 19:53 nvd
Patch available
CVE Published
Mar 05, 2026 - 21:16 nvd
HIGH 8.0

Tags

XSS Markus

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.

Analysis

MarkUs prior to version 2.9.1 fails to sanitize user-submitted file contents in the HTML rendering endpoint, allowing authenticated users with UI interaction to inject malicious scripts that execute in other users' browsers. An attacker can exploit this reflected cross-site scripting vulnerability to steal session tokens, modify grades, or perform actions on behalf of affected students and instructors. …

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Remediation

Within 24 hours: Identify all instances of MarkUs and their versions; notify affected stakeholders of the vulnerability. Within 7 days: Apply vendor patch to upgrade to version 2.9.1 or later across all production and staging environments. …

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Priority Score

40
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +40
POC: 0

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CVE-2026-28405 vulnerability details – vuln.today
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