Signal is active with 2 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
CVE-2026-28405 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>/submi… https://www.cve.org/CVERecord?id=CVE-2026-28405
Post summary
CVE-2026-28405 is disclosed for the MarkUs web application and appears fixed in version 2.9.1, with no Proof of Concept, exploit, or active exploitation reported.
🟠 CVE-2026-28405 - High MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.1, the courses//assignments//submissions/html_content route reads the contents of a stu... https://www.thehackerwire.com/vulnerability/CVE-2026-28405/ https://t.co/1pHnzamoxn
Post summary
The tweet announces a high‑severity vulnerability (CVE‑2026‑28405) in the MarkUs web application, describing how earlier versions expose student submission content via a specific route. It provides a technical glimpse of the flaw but no PoC, exploit, or patch information.
1 of 1 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | markusproject | markus | - | - | - |