Kirby CMS's pages.access permission is not checked during rendering of page drafts

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

6.0 · CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2026-44176: 0.36% estimated exploitation activity in the next 30 days; percentile 30.33 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

TL;DR This vulnerability affects all Kirby sites where users of a particular role have no permission to access pages (pages.access permission is disabled). This can be due to configuration in the user blueprint(s), via options in the model blueprint(s) or via a combination of both settings. Kirby sites are not affected if they intend all users of the site to be able to access all page drafts of the site. The vulnerability can only be exploited by authenticated users. Write actions are not affected by this vulnerability. ---- Introduction Missing authorization allows authenticated users to perform actions they are not intended to have access to. The effects of missing authorization can include unauthorized access to sensitive information as well as unauthorized changes to content or system information. Affected components Kirby's user permissions control which user role is allowed to perform specific actions to content models in the CMS. These permissions are defined for each role in…

Published by the source

26 May 2026, 23:55 UTC

Last modified by the source

26 May 2026, 23:55 UTC

Source last checked

26 Oct 2026, 14:40 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-2xw4-v2wx-hqq9

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# Patch Next advisory brief: CVE-2026-44176

Advisory: Kirby CMS's `pages.access` permission is not checked during rendering of page drafts
IDs: CVE-2026-44176, GHSA-2xw4-v2wx-hqq9
Record: https://patchnext.com/advisories/cve-2026-44176 (revision 1, source checked 26 Oct 2026, 14:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: getkirby/cms 5.4.1, 4.9.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist getkirby/cms: affected <= 4.9.0; >= 5.0.0, <= 5.4.0; fixed in 4.9.1, 5.4.1

## Suggested inspection (read-only)
- Packagist getkirby/cms: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on getkirby/cms.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-2xw4-v2wx-hqq9 (GitHub-reviewed advisory GHSA-2xw4-v2wx-hqq9 lists affected ranges: Packagist getkirby/cms >=0 =5.0.0 <=5.4.0)

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