Summary
Kirby CMS doesn't gate user avatar creation, replacement and deletion with user update permissions
TL;DR
This vulnerability affects all Kirby sites where users of a particular role have no permission to update user information (user.update or users.update permission is disabled). This can be due to configuration in the blueprint(s) of the acting users, via options in the blueprint(s) of the target users or via a combination of both settings.
Kirby sites are not affected if they intend all users of the site to be able to upload, replace or delete user avatars. The vulnerability can only be exploited by authenticated users.
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.
Impact
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 the user blueprint (site/blueprints/users/...). It is also possible to customize the permissions for each target model using the options feature (for user models again in the user blueprints). The permissions and options together control the authorization of user actions.
Kirby provides the user.update and users.update permissions (among others) that control the authorization to update user information for the user's own data or the data of other users respectively. User files are separately gated by the files.create, files.replace and files.delete permissions (among others).
In affected releases, Kirby only checked the files.create and files.delete permissions during changes to user avatars. Even though avatars are an integral part of the user profile, they were not covered by the user.update and users.update permissions. This allowed users with just file permissions to create, replace or delete user avatars.
The application does not perform an authorization check before performing a sensitive operation. Typical impact: unauthorized access to restricted functionality or data.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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The problem has been patched in Kirby 4.9.0 and Kirby 5.4.0. Please update to one of these or a later version to fix the vulnerability.
In all of the mentioned releases, we have added additional permission checks for user.update/users.update when a user avatar is created, replaced or deleted. These permission checks apply in addition to the file permission checks (files.create, files.replace and files.delete). When a user avatar is replaced with a file of the same type, Kirby now consistently checks the files.replace permission instead of a combination of files.create and files.delete.
Frequently Asked Questions
- What is CVE-2026-42174? CVE-2026-42174 is a medium-severity missing authorization vulnerability in getkirby/cms (composer), affecting versions <= 4.8.0. It is fixed in 4.9.0, 5.4.0. The application does not perform an authorization check before performing a sensitive operation.
- Which versions of getkirby/cms are affected by CVE-2026-42174? getkirby/cms (composer) versions <= 4.8.0 is affected.
- Is there a fix for CVE-2026-42174? Yes. CVE-2026-42174 is fixed in 4.9.0, 5.4.0. Upgrade to this version or later.
- Is CVE-2026-42174 exploitable, and should I be worried? Whether CVE-2026-42174 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-42174 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-42174?
- Upgrade
getkirby/cmsto 4.9.0 or later - Upgrade
getkirby/cmsto 5.4.0 or later
- Upgrade