CVE-2026-27807

low-risk
Published 2026-03-06

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.

Do I need to act?

-
0.07% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.9/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Markus

Affected Vendors

Markusproject

References (2)

Product https://github.com/MarkUsProject/Markus/releases/tag/v2.9.4
Vendor Advisory https://github.com/MarkUsProject/Markus/security/advisories/GHSA-m9rx-85mx-q9h6
25
/ 100
low-risk
Severity 20/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal