THREATPORT/VULNERABILITY/CVE-2021-29484
MEDIUM SEVERITY

CVE-2021-29484

Ghost vulnerability

CVSS
6.8
EPSS
7.9%
EPSS pct
94th
Exploited
No known
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.
Affected vendor
Ghost
Affected product
Ghost
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness type (CWE)
  • CWE-79 — Cross-Site Scripting (XSS)
Published
2021-04-29

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring no privileges, user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity.

Its EPSS score of 7.9% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 94% of all scored CVEs.

Check your external exposure to CVE-2021-29484

  • Confirm whether Ghost Ghost is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-29484.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-29484

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-29484 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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