{"id":"CVE-2026-28405","summary":"MarkUs: Stored XSS in Submission HTML Preview Enables Instructor-Context Actions","details":"MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.1, the courses/\u003c:course_id\u003e/assignments/\u003c:assignment_id\u003e/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.","aliases":["GHSA-p5pc-pxrj-3893"],"modified":"2026-04-10T05:41:06.339441Z","published":"2026-03-05T20:06:13.433Z","database_specific":{"cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28405.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/MarkUsProject/Markus/releases/tag/v2.9.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28405.json"},{"type":"ADVISORY","url":"https://github.com/MarkUsProject/Markus/security/advisories/GHSA-p5pc-pxrj-3893"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28405"},{"type":"FIX","url":"https://github.com/MarkUsProject/Markus/commit/55d74f2ddb72d2ec2f29aa2b4cb6b2da10755036"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/markusproject/markus","events":[{"introduced":"0"},{"fixed":"55d74f2ddb72d2ec2f29aa2b4cb6b2da10755036"}]}],"versions":["0.10.0","1.8.0-rc1","v1.10.0","v1.10.0-rc","v1.10.1","v1.10.1-rc","v1.10.2","v1.10.3","v1.10.4","v1.11.0","v1.11.1","v1.11.2","v1.11.3","v1.11.4","v1.11.5","v1.12.0","v1.12.1","v1.12.2","v1.12.3","v1.12.4","v1.12.5","v1.13.0","v1.13.1","v1.13.2","v1.13.3","v1.14.0","v1.8.0","v1.8.0-rc2","v1.8.1","v1.8.2","v1.8.3","v1.8.4","v1.9.0","v1.9.1","v1.9.2","v1.9.3","v2.0.0","v2.0.1","v2.0.10","v2.0.2","v2.0.3","v2.0.4","v2.0.5","v2.0.6","v2.0.7","v2.0.8","v2.0.9","v2.1.0","v2.1.1","v2.1.2","v2.1.3","v2.1.4","v2.1.5","v2.1.6","v2.1.7","v2.2.0","v2.2.1","v2.2.2","v2.2.3","v2.2.4","v2.3.0","v2.3.1","v2.3.2","v2.3.3","v2.3.4","v2.4.0","v2.4.1","v2.4.10","v2.4.11","v2.4.12","v2.4.2","v2.4.3","v2.4.4","v2.4.5","v2.4.6","v2.4.7","v2.4.8","v2.4.9","v2.5.0","v2.5.1","v2.5.2","v2.5.3","v2.6.0","v2.6.1","v2.7.0","v2.7.1","v2.8.0","v2.8.1","v2.8.2","v2.9.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-28405.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H"}]}