What is CVE-2026-24900?

CVE-2026-24900 is a medium-severity vulnerability in Markusproject Markus, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-02-09.

How severe is CVE-2026-24900?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Markusproject Markus

CVE-2026-24900

MarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, the courses/<:course_id>/assignments/<:assignment_id>/submissions/html_content accepted a select_file_id parameter to serve SubmissionFile o…

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.000 (13.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Markusproject Markus — versions < 2.9.1

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

https://github.com/MarkUsProject/Markus/security/advisories/GHSA-56gh-8hmq-7q88 (x_refsource_CONFIRM)
https://github.com/MarkUsProject/Markus/commit/7daed9fd2d44932223798d997b55094a3bff104b (x_refsource_MISC)
https://github.com/MarkUsProject/Markus/releases/tag/v2.9.1 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-24900?: CVE-2026-24900 is a medium-severity vulnerability in Markusproject Markus, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-02-09.
How severe is CVE-2026-24900?: Medium severity. CVSS v3 base score is 6.5 out of 10.