{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-28405", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-02-27T15:33:57.289Z", "datePublished": "2026-03-05T20:06:13.433Z", "dateUpdated": "2026-03-05T20:06:13.433Z"}, "containers": {"cna": {"title": "MarkUs: Stored XSS in Submission HTML Preview Enables Instructor-Context Actions", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/MarkUsProject/Markus/security/advisories/GHSA-p5pc-pxrj-3893", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/MarkUsProject/Markus/security/advisories/GHSA-p5pc-pxrj-3893"}, {"name": "https://github.com/MarkUsProject/Markus/commit/55d74f2ddb72d2ec2f29aa2b4cb6b2da10755036", "tags": ["x_refsource_MISC"], "url": "https://github.com/MarkUsProject/Markus/commit/55d74f2ddb72d2ec2f29aa2b4cb6b2da10755036"}, {"name": "https://github.com/MarkUsProject/Markus/releases/tag/v2.9.1", "tags": ["x_refsource_MISC"], "url": "https://github.com/MarkUsProject/Markus/releases/tag/v2.9.1"}], "affected": [{"vendor": "MarkUsProject", "product": "Markus", "versions": [{"version": "< 2.9.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-05T20:06:13.433Z"}, "descriptions": [{"lang": "en", "value": "MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.1, the courses/<:course_id>/assignments/<:assignment_id>/submissions/html_content route reads the contents of a student-submitted file and renders them without sanitization. This issue has been patched in version 2.9.1."}], "source": {"advisory": "GHSA-p5pc-pxrj-3893", "discovery": "UNKNOWN"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.1, the courses/<:course_id>/assignments/<:assignment_id>/submissions/html_content route reads the contents of a student-submitted file and renders them without sanitization. This issue has been patched in version 2.9.1."}], "id": "CVE-2026-28405", "lastModified": "2026-03-05T21:16:21.707", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-05T21:16:21.707", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/MarkUsProject/Markus/commit/55d74f2ddb72d2ec2f29aa2b4cb6b2da10755036"}, {"source": "security-advisories@github.com", "url": "https://github.com/MarkUsProject/Markus/releases/tag/v2.9.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/MarkUsProject/Markus/security/advisories/GHSA-p5pc-pxrj-3893"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}