{"id":"CVE-2018-17256","aliases":["GHSA-wrrj-r2j4-969w"],"url":"https://o3.security/vulnerability/CVE-2018-17256","summary":"Umbraco CMS vulnerable to stored XSS","details":"Persistent cross-site scripting (XSS) vulnerability in Umbraco CMS 7.12.3 allows authenticated users to inject arbitrary web script via the Header Name of a content (Blog, Content Page, etc.). The vulnerability is exploited when updating or removing public access of a content.","published":"2018-11-27T19:29:00.197Z","modified":"2026-07-08T19:45:23.274525Z","cvss":{"score":4.8,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.0084,"percentile":0.54723,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"NuGet","name":"umbraco","fixedVersion":null}],"fix":null,"references":[{"type":"ADVISORY","url":"https://www.cspcert.ph/advisories/2018/CVE-2018-17256.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-17256"},{"type":"PACKAGE","url":"https://github.com/umbraco/Umbraco-CMS"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T19:45:23.274525Z"}}