{"id":"GHSA-4fxf-xgrm-8fcj","summary":"FormCms avatar upload feature has a stored cross-site scripting (XSS) vulnerability","details":"FormCms v0.5.5 contains a stored cross-site scripting (XSS) vulnerability in the avatar upload feature. Authenticated users can upload .html files containing malicious JavaScript, which are accessible via a public URL. When a privileged user accesses the file, the script executes in their browser context.","aliases":["CVE-2025-56236"],"modified":"2025-08-28T17:27:25.201966Z","published":"2025-08-28T15:30:42Z","database_specific":{"github_reviewed_at":"2025-08-28T16:47:04Z","nvd_published_at":"2025-08-28T15:16:02Z","cwe_ids":["CWE-434","CWE-79"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-56236"},{"type":"WEB","url":"https://github.com/FormCms/FormCms/issues/27"},{"type":"WEB","url":"https://github.com/KKC73/me/blob/main/CVE-2025-56236/README.md"},{"type":"PACKAGE","url":"https://github.com/formcms/formcms"}],"affected":[{"package":{"name":"FormCMS","ecosystem":"NuGet","purl":"pkg:nuget/FormCMS"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.7"}]}],"versions":["0.4.4","0.4.5","0.4.6","0.4.7","0.4.8","0.4.9","0.5.0","0.5.1","0.5.2","0.5.3","0.5.4","0.5.5","0.5.6"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-4fxf-xgrm-8fcj/GHSA-4fxf-xgrm-8fcj.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"}]}