{"answers":{"affected":"2 open source packages ship an affected version, including UmbracoCms.Core. It affects 1 product.","exploited":"There is no known exploitation of CVE-2020-5809 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2020-5809 yet. Limit exposure of the affected software until one is available.","what":"CVE-2020-5809 is a medium-severity cross-site scripting vulnerability in Umbraco Umbraco Cms, published on 30 Dec 2020. 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-2020-5809 and fix it if it is affected.\n\nWhat it is: CVE-2020-5809 is a medium-severity cross-site scripting vulnerability in Umbraco Umbraco Cms, published on 30 Dec 2020. 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-2020-5809 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- UmbracoCms.Core (NuGet): affected all versions up to 8.9.1; no fix listed\n- UmbracoCms.Core (NuGet): affected all versions up to 8.9.1; no fix listed\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-2020-5809/ (Markdown: https://insights.sbomify.com/CVE-2020-5809/index.md)","id":"CVE-2020-5809","markdown":"https://insights.sbomify.com/CVE-2020-5809/index.md","name":"CVE-2020-5809","record":{"aliases":["GHSA-95qr-67rx-9pgh"],"analysis":{"component_type":"cms_plugin","fix_type":"upgrade","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Umbraco CMS","requires_auth":"low_privilege","summary":"Authenticated users can inject arbitrary JavaScript via TinyMCE iframes in Umbraco CMS, potentially leading to code execution or account takeover.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"tenable","cpe":[{"product":"umbraco_cms","vendor":"umbraco"}],"cvss":{"score":5.4,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"A stored XSS vulnerability exists in Umbraco CMS \u003c= 8.9.1 or current. An authenticated user can inject arbitrary JavaScript code into iframes when editing content using the TinyMCE rich-text editor, as TinyMCE is configured to allow iframes by default in Umbraco CMS.","ecosystems":["NuGet"],"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":"Umbraco CMS vulnerable to stored XSS","id":"CVE-2020-5809","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"NuGet","product":"umbraco:umbraco_cms","products":["umbraco:umbraco_cms"],"type":"xss","year":"2020"},"n_packages":2,"n_references":1,"next":{"headline":"Cross-site scripting in Umbraco CMS","id":"CVE-2020-5810"},"packages":[{"ecosystem":"NuGet","fixed":[],"introduced":["0"],"last_affected":["8.9.1"],"package":"UmbracoCms.Core","purl":null,"source":"GHSA-95qr-67rx-9pgh"},{"ecosystem":"NuGet","fixed":[],"introduced":["0"],"last_affected":["8.9.1"],"package":"UmbracoCms.Core","purl":"pkg:nuget/UmbracoCms.Core","source":"GHSA-95qr-67rx-9pgh"}],"prev":{"headline":"Missing authorization in Tenable.sc","id":"CVE-2020-5808"},"products":["Umbraco CMS"],"published":"2020-12-30","related":[{"cvss_score":10,"headline":"Umbraco CMS has an arbitrary file upload vulnerability","id":"CVE-2025-67288","kev_date_added":null,"published":"2025-12-22"},{"cvss_score":9.8,"headline":"File upload in n/a","id":"CVE-2014-10074","kev_date_added":null,"published":"2018-08-27"},{"cvss_score":9.8,"headline":"Server-side request forgery in n/a","id":"CVE-2012-1301","kev_date_added":null,"published":"2017-04-13"},{"cvss_score":9.3,"headline":"Umbraco CMS \u003c 4.7.1 codeEditorSave.asmx RCE","id":"CVE-2012-10054","kev_date_added":null,"published":"2025-08-13"},{"cvss_score":8.8,"headline":"Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users","id":"CVE-2025-32017","kev_date_added":null,"published":"2025-04-08"},{"cvss_score":8.8,"headline":"Umbraco CMS Authenticated File Upload","id":"CVE-2020-9471","kev_date_added":null,"published":"2020-03-16"},{"cvss_score":8.6,"headline":"Umbraco Remote ApplicationURL Overwrite","id":"CVE-2022-22690","kev_date_added":null,"published":"2022-01-18"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["n/a"]},"summary":"Authenticated users can inject arbitrary JavaScript via TinyMCE iframes in Umbraco CMS, potentially leading to code execution or account takeover.","url":"https://insights.sbomify.com/CVE-2020-5809/"}