Path Traversal in Markusproject Markus
CVE-2026-25057
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (39.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Markusproject Markus — versions < 2.9.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/MarkUsProject/Markus/security/advisories/GHSA-mccg-p332-252h (Vendor Advisory)
- github.com/MarkUsProject/Markus/commit/0ca002a1f0071c7a00dbb2ed34fede57323c5dc7 (Patch)
- github.com/MarkUsProject/Markus/releases/tag/v2.9.1 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-25057?
- CVE-2026-25057 is a critical-severity vulnerability in Markusproject Markus, classified under Relative Path Traversal. CVSS score: 9.1/10. Published 2026-02-09.
- How severe is CVE-2026-25057?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2026-25057 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.