{"cve":"CVE-2021-29484","nvd":{"published":"2021-04-29T21:15:08.590","modified":"2026-06-17T03:47:44.237","status":"Modified","description":"Ghost is a Node.js CMS. An unused endpoint added during the development of 4.0.0 has left sites vulnerable to untrusted users gaining access to Ghost Admin. Attackers can gain access by getting logged in users to click a link containing malicious code. Users do not need to enter credentials and may not know they've visited a malicious site. Ghost(Pro) has already been patched. We can find no evidence that the issue was exploited on Ghost(Pro) prior to the patch being added. Self-hosters are impacted if running Ghost a version between 4.0.0 and 4.3.2. Immediate action should be taken to secure your site. The issue has been fixed in 4.3.3, all 4.x sites should upgrade as soon as possible. As the endpoint is unused, the patch simply removes it. As a workaround blocking access to /ghost/preview can also mitigate the issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","score":6.8},"cwes":["CWE-79"],"references":["https://blog.sonarsource.com/ghost-admin-takeover","https://forum.ghost.org/t/critical-security-update-available-for-ghost-4-x/22290","https://github.com/TryGhost/Ghost/security/advisories/GHSA-9fgx-q25h-jxrg","https://www.npmjs.com/package/ghost","https://blog.sonarsource.com/ghost-admin-takeover"],"products":["ghost:ghost"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-29484","score":0.07935,"percentile":0.94733,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-9fgx-q25h-jxrg","url":"https://osv.dev/vulnerability/GHSA-9fgx-q25h-jxrg","summary":"DOM XSS in Theme Preview","modified":"2026-07-08T06:27:25.078743737Z","packages":[{"ecosystem":"npm","name":"ghost","purl":"pkg:npm/ghost","ranges":[">=4.0.0 <4.3.3"],"fixed":["4.3.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}