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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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8478a413cf4c9262be87d27ec39fe2ce3799f6031d3834520ec5d3609b7b059d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"Markus","vendor":"MarkUsProject","versions":[{"status":"affected","version":"< 2.9.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b6a78daa7210a91f42cd1a2dfad39de1875c6963468aba1e594786bb203827cc · sha256:d01b833bb665c248… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":4.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b6a78daa7210a91f42cd1a2dfad39de1875c6963468aba1e594786bb203827cc · sha256:d01b833bb665c248… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-776","description":"CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b6a78daa7210a91f42cd1a2dfad39de1875c6963468aba1e594786bb203827cc · sha256:d01b833bb665c248… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/MarkUsProject/Markus/releases/tag/v2.9.4","tags":["x_refsource_MISC"],"url":"https://github.com/MarkUsProject/Markus/releases/tag/v2.9.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b6a78daa7210a91f42cd1a2dfad39de1875c6963468aba1e594786bb203827cc · sha256:d01b833bb665c248… · /containers/cna/references/1
{"name":"https://github.com/MarkUsProject/Markus/security/advisories/GHSA-m9rx-85mx-q9h6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/MarkUsProject/Markus/security/advisories/GHSA-m9rx-85mx-q9h6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b6a78daa7210a91f42cd1a2dfad39de1875c6963468aba1e594786bb203827cc · sha256:d01b833bb665c248… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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