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.
References
Link | Resource |
---|---|
https://www.npmjs.com/package/ghost | Product Third Party Advisory |
https://forum.ghost.org/t/critical-security-update-available-for-ghost-4-x/22290 | Vendor Advisory |
https://github.com/TryGhost/Ghost/security/advisories/GHSA-9fgx-q25h-jxrg | Mitigation Third Party Advisory |
https://blog.sonarsource.com/ghost-admin-takeover | Exploit Third Party Advisory |
Configurations
Information
Published : 2021-04-29 14:15
Updated : 2021-09-14 11:47
NVD link : CVE-2021-29484
Mitre link : CVE-2021-29484
JSON object : View
CWE
CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Products Affected
ghost
- ghost