CVE-2026-45368Network attack vector

Stored XSS via dangerous-scheme URL filter bypass

Published Jul 16, 2026 · Updated Jul 16, 2026

Stored cross-site scripting in Content Folder Kirby before 4.9.1 and 5.0.0 through 5.4.0 allows remote authenticated users to inject script links. The URL methods fail to reject dangerous schemes when a crafted newline-bearing authority form passes the absolute-URL check, so four first-party renderers place it in href attributes. Exploitation requires content-update access and a visitor's click, which executes JavaScript in the site frontend and can expose a same-origin Panel session.

CVSS severity8.4
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Content Folder Kirby before 4.9.1 and 5.0.0 through 5.4.0 allows remote authenticated users to inject script links. The URL methods fail to reject dangerous schemes when a crafted newline-bearing authority form passes the absolute-URL check, so four first-party renderers place it in href attributes. Exploitation requires content-update access and a visitor's click, which executes JavaScript in the site frontend and can expose a same-origin Panel session.

The record

CVE
CVE-2026-45368
Published
Jul 16, 2026
Updated
Jul 16, 2026
Vendor
Content Folder
Product
Kirby
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 16, 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=< 4.9.1
  2. Affected versionversion=>= 5.0.0, < 5.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Content Folder · Kirbyversion=< 4.9.1; version=>= 5.0.0, < 5.4.1

Published CVSS scores

8.4GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')

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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