Home/CVE/MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs allows
CVE

CVE-2026-27807

MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs allows

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.

MEDIUM · CVSS 4.9 EPSS 0.00071
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-776Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
▤

Affected Products & Versions

1
markusproject markus< 2.9.4
▣

Scoring & Timeline

4.9
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD06 Mar 2026 · 04:16 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/MarkUsProject/Markus/releases/tag/v2.9.4ProductRelease Notes
https://github.com/MarkUsProject/Markus/security/advisories/GHSA-m9rx-85mx-q9h6Vendor Advisory
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