HOMEVULNERABILITIESCVE-2026-27807
MEDIUM

CVE-2026-27807

CWE-776Published: March 6, 2026· Updated: Mar 12, 2026

4.9
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:10.6th

Official 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.

NVD Source

Technical Analysis

CVE-2026-27807 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 4.9.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.High
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

markusproject1 product
markus
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttps://github.com/MarkUsProject/Markus/security/advisories/GHSA-m9rx-85mx-q9h6

All References (2)

→
https://github.com/MarkUsProject/Markus/releases/tag/v2.9.4Product · Release Notes
→
https://github.com/MarkUsProject/Markus/security/advisories/GHSA-m9rx-85mx-q9h6Vendor Advisory

Quick Facts

CVE IDCVE-2026-27807
CVSS Score4.9 / 10
SeverityMEDIUM
WeaknessCWE-776
CISA KEVNo
EPSS (30d)0.04%
Affected1 vendor
PublishedMar 6, 2026

Related CVEs (CWE-776)

CVE-2026-45771
7.5
CVE-2026-33036
7.5
CVE-2026-29074
7.5
CVE-2026-26278
7.5
CVE-2026-23822
5.3
CVE-2026-40260
5.3

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-27807 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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CVE-2026-27807 — CVSS 4.9 MEDIUM | CTIWATCH.COM