Is this vulnerability remotely exploitable over the web?

Yes. Any user with the ability to submit or upload assignment files can potentially craft a malicious submission. When another user views that submission through the vulnerable route, the attacker-controlled script can execute in the victim's browser.

What level of access does an attacker need?

The attacker typically needs authenticated access sufficient to submit assignment content in a course, such as a student account. They do not need elevated privileges; the attack is effective when a higher-privileged user (like an instructor or TA) later views the malicious submission.

What is the safest general fix pattern?

The safest pattern is to ensure that all submission contents are treated as untrusted and are either: - Rendered as plain text with proper HTML escaping, or - Passed through a strict HTML sanitizer that removes all active content. Additionally, the view code should avoid any "raw" rendering helpers that bypass escaping.

Severity:

HIGH RISK

(8.0)

Reflected Cross-Site Scripting (CWE-79) in MarkUs Assignment Submission Preview

CVE-2026-28405

Published:

Mar 5, 2026

Status:

Received

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-78

CRITICAL RISK

CRITICAL

(9.9)

Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

Remote Code Execution

March 7, 2026

CWE-89

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Remote Code Execution via SQL Injection on the Database Server

March 7, 2026

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Stored/Reflected Client-Side Code Execution in Users' Browsers

Severity:

HIGH RISK

(8.0)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Stored/Reflected Client-Side Code Execution in Users' Browsers

Severity:

HIGH RISK

(8.0)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Reflected Cross-Site Scripting (CWE-79) in MarkUs Assignment Submission Preview

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.9)

Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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