CVE-2026-25057: critical vulnerability in MarkUsProject Markus
Zip Slip in MarkUs config upload allowing RCE
Published · Updated
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.1epss 0.5%
MarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, instructors are able to upload a zip file to create an assignment from an exported configuration (courses/<:course_id>/assignments/upload_config_files). The uploaded zip file entry names are used to create paths to write files to disk without checking these paths. This vulnerability is fixed in 2.9.1.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected products
MarkUsProject · MarkusRelated CVEs — MarkUsProject Markus
In the same product, most dangerous first.
CVE-2024-47820MEDIUMMarkUs vulnerable to Path TraversalEPSS 0.7%CVE-2024-51743HIGHArbitrary File Write leading up to remote code execution (instructor accounts)EPSS 0.7%CVE-2024-51499HIGHMarkUs Arbitrary File Write leading up to remote code execution (student accounts)EPSS 0.7%CVE-2026-27807MEDIUMMarkUs: YAML alias (‘billion laughs’) DoS in config uploadEPSS 0.3%CVE-2026-24900MEDIUMMarkUs has a submission-view IDOR exposes all student submissionsEPSS 0.3%CVE-2026-25962MEDIUMMarkUs: Zip bomb in config upload enables DoSEPSS 0.3%