{"id":"CVE-2025-56236","aliases":["GHSA-4fxf-xgrm-8fcj"],"url":"https://o3.security/vulnerability/CVE-2025-56236","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.","published":"2025-08-28T00:00:00Z","modified":"2026-07-15T01:48:55.451176050Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"NuGet","name":"FormCMS","fixedVersion":"0.5.7"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/KKC73/me/blob/main/CVE-2025-56236/README.md"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/56xxx/CVE-2025-56236.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-56236"},{"type":"REPORT","url":"https://github.com/FormCms/FormCms/issues/27"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:48:55.451176050Z"}}