CVE-2026-53943Network attack vector

Staff account takeover via preview cache poisoning

Published Jun 24, 2026 · Updated Jun 24, 2026

Cache poisoning in Ghost 4.0.0 through 6.36.0 allows remote attackers to alter frontend responses through x-ghost-preview requests. The frontend preview handler trusts the x-ghost-preview header and renders request-specific preview output without preventing a shared cache from storing and reusing it. Exploitation requires a cache shared across visitors; staff account takeover requires the frontend and admin panel to share a domain, while separate domains have no staff exposure.

CVSS severity9.6
Critical
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cache poisoning in Ghost 4.0.0 through 6.36.0 allows remote attackers to alter frontend responses through x-ghost-preview requests. The frontend preview handler trusts the x-ghost-preview header and renders request-specific preview output without preventing a shared cache from storing and reusing it. Exploitation requires a cache shared across visitors; staff account takeover requires the frontend and admin panel to share a domain, while separate domains have no staff exposure.

The record

CVE
CVE-2026-53943
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
Ghost Foundation
Product
Ghost
Classifications
CWE-524, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 4.0.0, < 6.37.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ghost Foundation · Ghostversion=>= 4.0.0, < 6.37.0

Published CVSS scores

9.6GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-524Use of Cache Containing Sensitive Information
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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