{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-28405 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-28405 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-28405 is a high-severity cross-site scripting vulnerability in MarkUsProject Markus, published on 5 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-28405 and fix it if it is affected.\n\nWhat it is: CVE-2026-28405 is a high-severity cross-site scripting vulnerability in MarkUsProject Markus, published on 5 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-28405 in the wild and no public exploit code.\n\nAffected product: MarkUsProject Markus. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-28405/ (Markdown: https://insights.sbomify.com/CVE-2026-28405/index.md)","id":"CVE-2026-28405","markdown":"https://insights.sbomify.com/CVE-2026-28405/index.md","name":"CVE-2026-28405","record":{"aliases":["GHSA-p5pc-pxrj-3893"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution","privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"Markus grading system","requires_auth":"low_privilege","summary":"Attackers can inject malicious scripts into student submissions, allowing them to execute actions in the instructor context.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"markus","vendor":"markusproject"}],"cvss":{"score":8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"MarkUs: Stored XSS in Submission HTML Preview Enables Instructor-Context Actions","id":"CVE-2026-28405","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"kaniko has tar archive path traversal in build context extraction allows writing files outside destination directory","id":"CVE-2026-28406"},"packages":[],"prev":{"headline":"Textream Cross-Site WebSocket Hijacking (CSWSH) vulnerability","id":"CVE-2026-28403"},"products":["Markus"],"published":"2026-03-05","related":[{"cvss_score":9.1,"headline":"Zip Slip in MarkUs config upload allowing RCE","id":"CVE-2026-25057","kev_date_added":null,"published":"2026-02-09"},{"cvss_score":7.1,"headline":"MarkUs Arbitrary File Write leading up to remote code execution (student accounts)","id":"CVE-2024-51499","kev_date_added":null,"published":"2024-11-18"},{"cvss_score":7.1,"headline":"Arbitrary File Write leading up to remote code execution (instructor accounts)","id":"CVE-2024-51743","kev_date_added":null,"published":"2024-11-18"},{"cvss_score":6.5,"headline":"MarkUs: Zip bomb in config upload enables DoS","id":"CVE-2026-25962","kev_date_added":null,"published":"2026-03-06"},{"cvss_score":6.5,"headline":"MarkUs has a submission-view IDOR exposes all student submissions","id":"CVE-2026-24900","kev_date_added":null,"published":"2026-02-09"},{"cvss_score":5.7,"headline":"MarkUs vulnerable to Path Traversal","id":"CVE-2024-47820","kev_date_added":null,"published":"2024-11-18"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-03-06","vendors":["MarkUsProject"]},"summary":"Attackers can inject malicious scripts into student submissions, allowing them to execute actions in the instructor context.","url":"https://insights.sbomify.com/CVE-2026-28405/"}