CVE-2026-49276Network attack vector

Panel script execution via unsanitized writer links

Published Jul 9, 2026 · Updated Jul 9, 2026

Cross-site scripting in Kirby before 4.9.4 and 5.0.0 through 5.4.3 allows remote attackers to execute JavaScript via writer links. The writer field's link and email marks accept dangerous URL schemes and make the submitted target clickable before backend sanitization on save. Exploitation requires a writer-enabled blueprint and a Panel user to click the injected link; default configurations limit execution to that user's Panel session.

CVSS severity7.4
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Kirby before 4.9.4 and 5.0.0 through 5.4.3 allows remote attackers to execute JavaScript via writer links. The writer field's link and email marks accept dangerous URL schemes and make the submitted target clickable before backend sanitization on save. Exploitation requires a writer-enabled blueprint and a Panel user to click the injected link; default configurations limit execution to that user's Panel session.

The record

CVE
CVE-2026-49276
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Content Folder
Product
Kirby
Classifications
CWE-83, CAPEC-243, CAPEC-244, CAPEC-588, T1204.001
Attack vector
network
Privileges
unauthenticated

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

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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

7.4GitHub, Inc.CVSS:4.0/AV:N/AC:H/AT:N/PR:N/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 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-83Improper Neutralization of Script in Attributes in a Web Page
CAPEC-243XSS Targeting HTML Attributes
CAPEC-244XSS Targeting URI Placeholders
CAPEC-588DOM-Based XSS
T1204.001User Execution: Malicious Link

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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