CVE-2026-33159
published 2026-03-24CVE-2026-33159: Craft CMS is a content management system (CMS). From version 4.0.0-RC1 to before version 4.17.8 and from version 5.0.0-RC1 to before version 5.9.14, guest…
PriorityP338medium6.5CVSS 3.1
AVNACLPRNUINSUCLILAN
EPSS
0.31%
22.5th percentile
Craft CMS is a content management system (CMS). From version 4.0.0-RC1 to before version 4.17.8 and from version 5.0.0-RC1 to before version 5.9.14, 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. This issue has been patched in versions 4.17.8 and 5.9.14.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| craftcms | cms | — | — |
| craftcms | cms | — | — |
| craftcms | cms | >= 4.0.0-RC1 < 4.17.8 | 4.17.8 |
| craftcms | cms | >= 5.0.0-RC1 < 5.9.14 | 5.9.14 |
| craftcms | craft_cms | < 4.17.8 | 4.17.8 |
| craftcms | craft_cms | < 5.9.14 | 5.9.14 |
| craftcms | craft_cms | — | — |
| craftcms | craft_cms | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
nvdv4.06.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
OSV
Craft CMS: Unauthenticated Users Can Perform Restricted Project Config Sync Operations
osv·2026-03-24
CVE-2026-33159 [MEDIUM] Craft CMS: Unauthenticated Users Can Perform Restricted Project Config Sync Operations
Craft CMS: Unauthenticated Users Can Perform Restricted Project Config Sync Operations
### 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
GHSA
Craft CMS: Unauthenticated Users Can Perform Restricted Project Config Sync Operations
ghsa·2026-03-24
CVE-2026-33159 [MEDIUM] CWE-306 Craft CMS: Unauthenticated Users Can Perform Restricted Project Config Sync Operations
Craft CMS: Unauthenticated Users Can Perform Restricted Project Config Sync Operations
### 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
No detection rules found.
No public exploits indexed.
2026-03-24
Published