🛡️ CVE-2026-25057 — markus

🔴 CVSS 9.1 — Critical ✅ No Known Exploit CWE-23 NVD
9.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-25057 is classified as CWE-23: Relative Path Traversal. Relative path sequences in user input are not neutralised, so requests can climb out of the intended directory.

Affected software

CVE-2026-25057 is recorded against 1 package.

  • markus (fixed in 2.9.1)

Timeline and source

Published on 9 February 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com
github.com

Details

Severity CRITICAL
CVSS Score 9.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE CWE-23
Public Exploit ✅ No
Source NVD
Published 2026-02-09
Updated 2026-08-11
Modified 2026-06-17

Affected Packages

Software From version Fixed in
markus — 2.9.1

Similar Threats

Exploit Protection

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CVE-2026-25057 carries CVSS 9.1 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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