CVE-2026-33159

EPSS 0.02%

Craft CMS: Unauthenticated Users Can Perform Restricted Project Config Sync Operations

Published: 3/24/2026Modified: 3/25/2026
Also known as:GHSA-6mrr-q3pj-h53w

Description

### Summary Guest users can access Config Sync updater `index`, obtain signed `data`, and execute state-changing Config Sync actions (`regenerate-yaml`, `apply-yaml-changes`) without authentication. ### Details `ConfigSyncController` extends `BaseUpdaterController`, and the base updater is anonymously accessible for control panel requests. `index` emits signed updater state (`data`), which can be reused by guests in subsequent requests. Sensitive actions that are reachable via this method are `actionApplyYamlChanges`, `actionRegenerateYaml`, `applyExternalChanges`, and `regenerateExternalConfig`. #### Reproduction steps 1. Guest POST to: http POST /admin/actions/config-sync/index 2. Extract data from returned JS state: Craft.updater = ... setState({"data":"<signedData>", ...}); 3. Reuse data as a guest: ``` POST /admin/actions/config-sync/regenerate-yaml data=<signedData>&<csrfParam>=<csrfToken> ``` or ``` POST /admin/actions/config-sync/apply-yaml-changes data=<signedData>&<csrfParam>=<csrfToken> ``` 4. Observe completed response and state/file changes. ### Impact Unauthenticated users can execute project configuration sync operations that should be restricted to trusted admin/deployment contexts. Depending on the pending YAML/config state, this can cause unauthorized config state transitions and a service integrity risk. ### Resources https://github.com/craftcms/cms/commit/7f0ead833f7

Affected packages (1)

CVSS scores

SourceVersionSeverityVector
osvCVSS 4.0—CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References (6)