CVE-2026-42137Network attack vector

Restricted content disclosure via inconsistent listability checks

Published May 9, 2026 · Updated May 9, 2026

Missing authorization in Content Folder Kirby before 4.9.0 and 5.0.0 through 5.3.3 allows remote authenticated users to read restricted content. REST API collections, related-model responses, Panel change listings, images, and file navigation omit or apply the wrong isListable permission check. An account with a role denied pages.access, pages.list, files.access, or files.list can read hidden page or file data; write actions remain blocked.

CVSS severity7.1
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Content Folder Kirby before 4.9.0 and 5.0.0 through 5.3.3 allows remote authenticated users to read restricted content. REST API collections, related-model responses, Panel change listings, images, and file navigation omit or apply the wrong isListable permission check. An account with a role denied pages.access, pages.list, files.access, or files.list can read hidden page or file data; write actions remain blocked.

The record

CVE
CVE-2026-42137
Published
May 9, 2026
Updated
May 9, 2026
Vendor
Content Folder
Product
Kirby
Classifications
CWE-862, CWE-863, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 9, 2026CVE publishedPublication date reported by the CVE source.
  2. May 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=< 4.9.0
  2. Affected versionversion=>= 5.0.0, < 5.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Content Folder · Kirbyversion=< 4.9.0; version=>= 5.0.0, < 5.4.0

Published CVSS scores

7.1GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/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-862Missing Authorization
CWE-863Incorrect Authorization
T1213Data from Information Repositories

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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