CVE-2026-28405

5.4 mediumEPSS 0.3%

Medium (5.4) in markusproject markus. EPSS 0.3% chance of exploitation in the next 30 days.

MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.1, the courses/<:course_id>/assignments/<:assignment_id>/submissions/html_content route reads the contents of a student-submitted file and renders them without sanitization. This issue has been patched in version 2.9.1.

Severity

CVSS 3.1

5.4 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 17% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-03-05
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

markusproject:markus

References

https://github.com/MarkUsProject/Markus/commit/55d74f2ddb72d2ec2f29aa2b4cb6b2da10755036
https://github.com/MarkUsProject/Markus/releases/tag/v2.9.1
https://github.com/MarkUsProject/Markus/security/advisories/GHSA-p5pc-pxrj-3893

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