What is 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/ /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 severe is CVE-2026-25057?

CVE-2026-25057 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-25057 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25057?

CVE-2026-25057 affects Markusproject Markus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25057?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-25057 have an EU (EUVD) identifier?

Yes. CVE-2026-25057 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6838.

When was CVE-2026-25057 published?

CVE-2026-25057 was published on 2026-02-09 and last updated on 2026-06-17.

CVE-2026-25057

CVE-2026-25057 is a critical-severity vulnerability in Markusproject Markus with a CVSS 3.x base score of 9.1. 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-23.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-6838
Weakness: CWE-23
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, 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.

Frequently asked questions

What is 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.
How severe is CVE-2026-25057?: CVE-2026-25057 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-25057 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25057?: CVE-2026-25057 affects Markusproject Markus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25057?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-25057 have an EU (EUVD) identifier?: Yes. CVE-2026-25057 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6838.
When was CVE-2026-25057 published?: CVE-2026-25057 was published on 2026-02-09 and last updated on 2026-06-17.

References

Affected products (1)

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

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