How severe is CVE-2026-24900?

CVE-2026-24900 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-24900 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-24900?

CVE-2026-24900 affects Markusproject Markus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-24900?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-24900 have an EU (EUVD) identifier?

Yes. CVE-2026-24900 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6494.

When was CVE-2026-24900 published?

CVE-2026-24900 was published on 2026-02-09 and last updated on 2026-06-17.

CVE-2026-24900

CVE-2026-24900 is a medium-severity vulnerability in Markusproject Markus with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-639.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-6494
Weakness: CWE-639
Affected product: Markusproject Markus
Published: 2026-02-09
Last modified: 2026-06-17

Description

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 objects containing a record of files submitted by students. This parameter was not correctly scoped to the requesting user, allowing users access arbitrary submission file contents by id. This vulnerability is fixed in 2.9.1.

Frequently asked questions

What is 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 objects containing a record of files submitted by students. This parameter was not correctly scoped to the requesting user, allowing users access arbitrary submission file contents by id. This vulnerability is fixed in 2.9.1.
How severe is CVE-2026-24900?: CVE-2026-24900 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-24900 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-24900?: CVE-2026-24900 affects Markusproject Markus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-24900?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-24900 have an EU (EUVD) identifier?: Yes. CVE-2026-24900 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6494.
When was CVE-2026-24900 published?: CVE-2026-24900 was published on 2026-02-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:markusproject:markus:*:*:*:*:*:*:*:*

More vulnerabilities in Markusproject Markus

CVE-2026-25057 — Critical (CVSS 9.1): MarkUs is a web application for the submission and grading of student assignments. Prior to 2.9.1, instructors are able…
CVE-2024-51743 — High (CVSS 8.8): MarkUs is a web application for the submission and grading of student assignments. In versions prior to 2.4.8, an…
CVE-2024-51499 — High (CVSS 8.8): MarkUs is a web application for the submission and grading of student assignments. In versions prior to 2.4.8, an…
CVE-2026-28405 — High (CVSS 8.0): MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.1, the…
CVE-2026-25962 — Medium (CVSS 6.5): MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs…
CVE-2024-47820 — Medium (CVSS 5.7): MarkUs, a web application for the submission and grading of student assignments, is vulnerable to path traversal in…

All CVEs affecting Markusproject Markus →

Other CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities

CVE-2025-40805 — Critical (CVSS 10.0): Affected devices do not properly enforce user authentication on specific API endpoints. This could facilitate an…
CVE-2024-45032 — Critical (CVSS 10.0): A vulnerability has been identified in Industrial Edge Management Pro (All versions < V1.9.5), Industrial Edge…
CVE-2026-34037 — Critical (CVSS 9.9): Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to…
CVE-2026-52782 — Critical (CVSS 9.9): OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, there is an IDOR through…
CVE-2026-45552 — Critical (CVSS 9.9): Roxy-WI is a web interface for managing Haproxy, Nginx, Apache and Keepalived servers. In versions 8.2.6.4 and prior,…
CVE-2026-29200 — Critical (CVSS 9.9): A critical IDOR vulnerability has been discovered in Comet Backup affecting all versions from 20.11.0 to 26.1.1 and…

Browse all CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities →