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VulnerabilityPublished

CVE-2026-53947: TryGhost Ghost · Observable Response Discrepancy

Affects TryGhost GhostSource CVE Database V5

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Not known to be exploited · CVSS 5.3 Medium : upgrade to 6.21.1 when convenient.

Data as of 6 Nov 2026, 23:24 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 28% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 6.21.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade TryGhost Ghost to 6.21.1.

Affected software

ProductAffectedFixed in
TryGhostGhostAffected
  • >=5.18.0 <6.21.1
Fixed in
  • 6.21.1

AI-suggested

The vulnerability is fixed in Ghost version 6.21.1. Users should upgrade to version 6.21.1 or later to remediate this issue. Patch status is not explicitly confirmed via a vendor advisory, but the description states the fix is included in 6.21.1. Until upgraded, users should be aware of the risk of email enumeration via signin endpoints.

Description

Ghost is a Node.js content management system. From 5.18.0 until 6.21.1, a discrepancy in responses from the members signin endpoints made it possible for an unauthenticated attacker to determine whether a given email address belongs to a registered member of a Ghost site. This vulnerability is fixed in 6.21.1.

References

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