How severe is CVE-2026-27807?

CVE-2026-27807 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-27807 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27807?

CVE-2026-27807 affects Markusproject Markus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27807?

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

Does CVE-2026-27807 have an EU (EUVD) identifier?

Yes. CVE-2026-27807 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9968.

When was CVE-2026-27807 published?

CVE-2026-27807 was published on 2026-03-06 and last updated on 2026-06-17.

CVE-2026-27807

CVE-2026-27807 is a medium-severity vulnerability in Markusproject Markus with a CVSS 3.x base score of 4.9. 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-776.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9968
Weakness: CWE-776
Affected product: Markusproject Markus
Published: 2026-03-06
Last modified: 2026-06-17

Description

MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs allows course instructors to upload YAML files to create/update various entities (e.g., assignment settings). These YAML files are parsed with aliases enabled. This issue has been patched in version 2.9.4.

Frequently asked questions

What is CVE-2026-27807?: MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.4, MarkUs allows course instructors to upload YAML files to create/update various entities (e.g., assignment settings). These YAML files are parsed with aliases enabled. This issue has been patched in version 2.9.4.
How severe is CVE-2026-27807?: CVE-2026-27807 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-27807 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27807?: CVE-2026-27807 affects Markusproject Markus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27807?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-27807 have an EU (EUVD) identifier?: Yes. CVE-2026-27807 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9968.
When was CVE-2026-27807 published?: CVE-2026-27807 was published on 2026-03-06 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…
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