GHSA-r3w8-2c5r-h9j9 CVE-2026-54005
Kirby: `pages.access` permission is not checked in the `site/find` REST API route
- Severity
- 0.0 / 10
- High · CVSS 4.0
- Exploit chance (EPSS)
- 0.43%
- Chance of exploitation in the next 30 days. Higher than 37.02% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-862 Missing Authorization
- Fix
4.9.4- Upgrade getkirby/cms to this version or later
Description
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), options in the model blueprint(s), or a combination of both settings.
It was possible to retrieve page information (including full content and metadata) for arbitrary pages via the /api/site/find route without being authorized to access the respective pages.
This vulnerability is of high severity for affected sites.
Your Kirby sites are not affected if you intend all users of your site to be able to access all pages of the site. The vulnerability can only be exploited by authenticated users that know or guess the IDs or UUIDs of pages. Write actions as well as access to draft pages 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
The /api/site/find route allows callers to request model data for a collection of user-selected pages. This model data includes structural metadata about the page itself and its children, siblings, and files and can also be extended via a query parameter to return full page content and additional metadata. The pages to return can be queried by a list of page IDs and/or UUIDs. Draft pages are excluded from this route as it only supports querying published pages.
Impact
In affected releases, Kirby did not check whether the queried pages were accessible to the currently authenticated user.
This can lead to disclosure of sensitive information contained in inaccessible pages, including the confirmation of the existence of individual pages as well as disclosure of sensitive content fields stored in the pages. Linked children, siblings, or files were not affected by this vulnerability as they were already properly filtered by the appropriate pages.list and files.list permissions.
Because the /api/site/find route is read-only, the vulnerability does not allow malicious write access.
Patches
The problem has been patched in Kirby 4.9.4 and Kirby 5.4.4. Please update to one of these or a later version to fix the vulnerability.
In all of the mentioned releases, we added a filter ensuring that the /api/site/find route only returns pages that are accessible to the current user.
Credits
Thanks to Rizky Muhammad (@EvidentObscurity) for responsibly reporting the identified issue.
Affected versions
Packagist
| Package | Vulnerable | Fixed in |
|---|---|---|
| getkirby/cms | < 4.9.4 |
4.9.4 |
| getkirby/cms | >= 5.0.0-alpha.1, < 5.4.4 |
5.4.4 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
getkirby/cms Packagist → 4.9.4
- composer
composer require getkirby/cms:^4.9.4
Severity breakdown
CVSS 4.0 0.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- Low
- User interaction
- None
- Confidentiality (vulnerable system)
- High
- Integrity (vulnerable system)
- None
- Availability (vulnerable system)
- None
- Confidentiality (subsequent systems)
- None
- Integrity (subsequent systems)
- None
- Availability (subsequent systems)
- None
Weakness
CWE-862: Missing Authorization
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
How to prevent it
- Architecture and Design: Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) [REF-229] to enforce the roles at the appropriate boundaries. Note that this approach may not protect against horizontal authorization, i.e., it will not protect a user from attacking others with the same role.
- Architecture and Design: Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records. For example, a database may restrict access for medical records to a specific database user, but each record might only be intended to be accessible to the patient and the patient's doctor [REF-7].
- Architecture and Design: Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, consider using authorization frameworks such as the JAAS Authorization Framework [REF-233] and the OWASP ESAPI Access Control feature [REF-45].
- Architecture and Design: For web applications, make sure that the access control mechanism is enforced correctly at the server side on every page. Users should not be able to access any unauthorized functionality or information by simply requesting direct access to that page. One way to do this is to ensure that all pages containing sensitive information are not cached, and that all such pages restrict access to requests that are accompanied by an active and authenticated session token associated with a user who has the required permissions to access that page.
- System Configuration, Installation: Use the access control capabilities of your operating system and server environment and define your access control lists accordingly. Use a "default deny" policy when defining these ACLs.
References
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-9vx2-j98c-p72w Kirby: Access to image files and limited access to JSON files outside of the site root via path traversal in the media handling | High | Also affects getkirby/cms |
| GHSA-6j4c-mgqr-qv76 Kirby: Access to image files outside of the site root via path traversal in the media handling | Medium | Also affects getkirby/cms |
| GHSA-67mx-6wf2-92xp Kirby: File upload permissions are not checked during processing of chunk data | High | Also affects getkirby/cms |
| GHSA-rf2p-vh74-7vvh Kirby: System path exposure from error messages in the REST API | Medium | Also affects getkirby/cms |
| GHSA-89cp-7p28-jffg Kirby: Access to files of top-level drafts is not protected by permissions | Medium | Also affects getkirby/cms |
| GHSA-whxw-24jc-cwmv Kirby: External Initialization of the Panel on reverse proxy setups with the `Forwarded` header | Critical | Also affects getkirby/cms |
| GHSA-wr9h-4r83-f4v6 Kirby: Cross-site scripting (XSS) from incomplete HTML/XML sanitization in `Dom::sanitize()` | High | Also affects getkirby/cms |
| GHSA-4v4h-m2qq-ppgw Kirby: Request header injection in `Http\Remote` | Medium | Also affects getkirby/cms |
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