CVE-2021-29484
An unused endpoint added during the development of 4.0.0 has left sites vulnerable to untrusted users gaining access to Ghost Admin.
Does this matter?
Lower severity and a low EPSS score (7.94%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 6.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
- EPSS
- 7.94% probability · 94th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- ghost/ghost
- Source
- security-advisories@github.com
References
- https://blog.sonarsource.com/ghost-admin-takeoverExploit, Third Party Advisory
- https://forum.ghost.org/t/critical-security-update-available-for-ghost-4-x/22290Vendor Advisory
- https://github.com/TryGhost/Ghost/security/advisories/GHSA-9fgx-q25h-jxrgMitigation, Third Party Advisory
- https://www.npmjs.com/package/ghostProduct, Third Party Advisory
- https://blog.sonarsource.com/ghost-admin-takeoverExploit, Third Party Advisory
- https://forum.ghost.org/t/critical-security-update-available-for-ghost-4-x/22290Vendor Advisory
- https://github.com/TryGhost/Ghost/security/advisories/GHSA-9fgx-q25h-jxrgMitigation, Third Party Advisory
- https://www.npmjs.com/package/ghostProduct, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.