CVE-2026-27807: MarkUs is a web application for the submission and grading of student assignments

Q: How do I fix CVE-2026-27807?

markus: upgrade to 2.9.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-27807 being exploited?

CVE-2026-27807 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-27807 affect?

CVE-2026-27807 affects markus. Severity is medium (CVSS 4.9). 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

Q: How urgent is CVE-2026-27807?

Priority 23/100. No elevated risk signals yet.

Routine

MEDIUM 4.9UPGRADE

CVE-2026-27807 is a medium-severity flaw (CVSS 4.9) affecting markus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-776
Published	2026-03-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: markusproject

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-06 04:16 UTCPublished CVE record published
2026-06-17 10:27 UTCUpdated Record last modified

markusproject markus UPGRADE

Affected: < 2.9.4

Fixed in: 2.9.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy markus || rpm -q markus || markus --version

2. UPGRADE to 2.9.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade markus

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade markus

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-27807?

markus: upgrade to 2.9.4. Exact commands for each OS are on this page.

Is CVE-2026-27807 being exploited?

CVE-2026-27807 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-27807 affect?

CVE-2026-27807 affects markus. Severity is medium (CVSS 4.9). 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

How urgent is CVE-2026-27807?

Priority 23/100. No elevated risk signals yet.

Related CVEs

CVE-2026-28405 HIGH 8.0 UPGRADE MarkUs is a web application for the submission and grading of student assignments
CVE-2026-25962 MEDIUM 6.5 UPGRADE MarkUs is a web application for the submission and grading of student assignments
CVE-2024-51743 HIGH 8.8 UPGRADE MarkUs is a web application for the submission and grading of student assignments
CVE-2024-51499 HIGH 8.8 UPGRADE MarkUs is a web application for the submission and grading of student assignments
CVE-2024-47820 MEDIUM 5.7 UPGRADE MarkUs, a web application for the submission and grading of student assignments, is vulnerable to path travers

References

← Back to latest CVEs