CVE-2026-54002Network attack vector

Stored XSS via unsanitized unwrapped child nodes

Published Jul 9, 2026 · Updated Jul 9, 2026

Stored XSS in Content Folder Kirby 4.9.3 and earlier and 5.0.0 through 5.4.3 allows remote authenticated users to execute JavaScript. Dom::sanitize() clones children of unknown HTML or XML tags into the output without applying the remaining sanitization pass to those nodes. An authenticated editor must submit untrusted content through an affected field or sanitization API; execution occurs when another user or visitor renders the stored content.

CVSS severity8.5
High
EPSS probability0.55%
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 Content Folder Kirby 4.9.3 and earlier and 5.0.0 through 5.4.3 allows remote authenticated users to execute JavaScript. Dom::sanitize() clones children of unknown HTML or XML tags into the output without applying the remaining sanitization pass to those nodes. An authenticated editor must submit untrusted content through an affected field or sanitization API; execution occurs when another user or visitor renders the stored content.

The record

CVE
CVE-2026-54002
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Content Folder
Product
Kirby
Classifications
CWE-87, CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 4.9.4
  2. Affected versionversion=>= 5.0.0, < 5.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Content Folder · Kirbyversion=< 4.9.4; version=>= 5.0.0, < 5.4.4

Published CVSS scores

8.5GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

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-87Improper Neutralization of Alternate XSS Syntax
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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