CVE-2026-27807 | THREATINT

Description

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.

PUBLISHED Reserved 2026-02-24 | Published 2026-03-06 | Updated 2026-03-06 | Assigner GitHub_M

MEDIUM: 4.9CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Problem types

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

Product status

< 2.9.4

affected

References

github.com/...Markus/security/advisories/GHSA-m9rx-85mx-q9h6

github.com/MarkUsProject/Markus/releases/tag/v2.9.4

cve.org (CVE-2026-27807)

nvd.nist.gov (CVE-2026-27807)

Download JSON