CVE-2024-51499: high-severity vulnerability in MarkUsProject Markus
MarkUs Arbitrary File Write leading up to remote code execution (student accounts)
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.1epss 0.7%
MarkUs is a web application for the submission and grading of student assignments. In versions prior to 2.4.8, an arbitrary file write vulnerability accessible via the update_files method of the SubmissionsController allows authenticated users (e.g. students) to write arbitrary files to any location on the web server MarkUs is running on (depending on the permissions of the underlying filesystem). e.g. This can lead to a delayed remote code execution in case an attacker is able to write a Ruby file into the config/initializers/ subfolder of the Ruby on Rails application. MarkUs v2.4.8 has addressed this issue. No known workarounds are available at the application level aside from upgrading.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
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-2026-25057CRITICALZip Slip in MarkUs config upload allowing RCEEPSS 0.5%CVE-2026-27807MEDIUMMarkUs: YAML alias (‘billion laughs’) DoS in config uploadEPSS 0.3%CVE-2026-25962MEDIUMMarkUs: Zip bomb in config upload enables DoSEPSS 0.3%CVE-2026-24900MEDIUMMarkUs has a submission-view IDOR exposes all student submissionsEPSS 0.3%