CVE-2026-70596Network attack vector

Staff privilege escalation via unsanitized image captions

Published Aug 5, 2026 · Updated Aug 5, 2026

Stored XSS in Ghost 4.9.0 through 6.54.0 allows remote authenticated users to hijack another staff user's Admin session via a crafted caption. Ghost's frontend context preparation treated feature_image_caption as a Handlebars SafeString without sanitizing its HTML, and the Admin post-history preview rendered the same untrusted caption. Any staff account can store the payload, but another staff user must view affected content for script execution and session takeover.

CVSS severity4.3
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Ghost 4.9.0 through 6.54.0 allows remote authenticated users to hijack another staff user's Admin session via a crafted caption. Ghost's frontend context preparation treated feature_image_caption as a Handlebars SafeString without sanitizing its HTML, and the Admin post-history preview rendered the same untrusted caption. Any staff account can store the payload, but another staff user must view affected content for script execution and session takeover.

The record

CVE
CVE-2026-70596
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
Ghost Foundation
Product
Ghost
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=>= 4.9.0, < 6.54.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ghost Foundation · Ghostversion=>= 4.9.0, < 6.54.1

Published CVSS scores

4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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