Markus CVE-2026-27807
MEDIUM
Improper Restriction of Recursive Entity References in DTDs (CWE-776)
2026-03-06
security-advisories@github.com
4.9
CVSS 3.1
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CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Lifecycle Timeline
2
Analysis Generated
Mar 12, 2026 - 22:06 vuln.today
CVE Published
Mar 06, 2026 - 04:16 nvd
MEDIUM 4.9
DescriptionNVD
MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs allows course instructors to upload YAML files to create/update various entities (e.g., assignment settings). These YAML files are parsed with aliases enabled. This issue has been patched in version 2.9.4.
AnalysisAI
Markus versions up to 2.9.4 is affected by improper restriction of recursive entity references in dtds (CVSS 4.9).
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RemediationAI
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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External POC / Exploit Code
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Destination URL
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