CVE-2026-70588Network attack vectorHinoki check available

Stored XSS via unsafe imported content rendering

Published Aug 4, 2026 · Updated Aug 4, 2026

Stored cross-site scripting in Ghost 5.26.0 through 6.54.0 allows remote authenticated users to inject script through Universal Import. The importer embeds item.url in href attributes without scheme validation or escaping, while caption paths mark unsanitized feature_image_caption values as safe HTML. Exploitation requires high-privileged Ghost Admin access and imported content; the script persists in posts and executes when the affected content is rendered.

CVSS severity5.0
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored cross-site scripting in Ghost 5.26.0 through 6.54.0 allows remote authenticated users to inject script through Universal Import. The importer embeds item.url in href attributes without scheme validation or escaping, while caption paths mark unsanitized feature_image_caption values as safe HTML. Exploitation requires high-privileged Ghost Admin access and imported content; the script persists in posts and executes when the affected content is rendered.

The record

CVE
CVE-2026-70588
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
Ghost Foundation
Product
Ghost
Classifications
CWE-79
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=>= 5.26.0, < 6.54.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Ghost Foundation · Ghostversion=>= 5.26.0, < 6.54.1

Published CVSS scores

5.0GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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