CVE-2026-25057
Path Traversal in MarkUs Assignment Upload Allows Arbitrary File Write
Publication date: 2026-02-09
Last updated on: 2026-02-19
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| markusproject | markus | to 2.9.1 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-23 | The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory. |
Attack-Flow Graph
AI Powered Q&A
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
The vulnerability is fixed in MarkUs version 2.9.1. The immediate step to mitigate this vulnerability is to upgrade your MarkUs installation to version 2.9.1 or later.
Can you explain this vulnerability to me?
This vulnerability exists in the MarkUs web application prior to version 2.9.1. It allows instructors to upload a zip file to create an assignment from an exported configuration. The issue arises because the application uses the zip file entry names to create file paths on disk without validating or checking these paths. This can lead to unsafe file writes.
How can this vulnerability impact me? :
The vulnerability can have severe impacts as indicated by its high CVSS score of 9.1. Because the application does not validate file paths from the uploaded zip, an attacker with instructor privileges could write files to arbitrary locations on the server. This can lead to complete compromise of confidentiality, integrity, and availability of the system.