CVE-2026-84800 Details
Description
Craft CMS versions >= 5.0.0-RC1 and < 5.10.11 contain a missing authorization vulnerability in AssetsController::actionReplaceFile. When a request supplies sourceAssetId and targetFilename but omits assetId, the target asset is resolved by folder and filename after the permission checks execute, so the replacePeerFiles permission is never enforced. An authenticated low-privilege author with only the replaceFiles permission on a shared folder can overwrite the content of a peer's asset file (located in the same folder) with attacker-controlled bytes. Fixed in 5.10.11.
A missing authorization vulnerability has been identified in Craft CMS versions 5.0.0-RC1 prior to 5.10.11. The issue resides in the AssetsController's actionReplaceFile method. When a request includes sourceAssetId and targetFilename but omits assetId, the target asset is determined by folder and filename after permission checks have been applied. This oversight allows an authenticated low-privilege author with only the replaceFiles permission on a shared folder to overwrite a peer's asset file in the same folder with attacker-controlled data. The vulnerability has been patched in version 5.10.11.
Users can upgrade to Craft CMS version 5.10.11 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 2, 2026CISA-ADP
Assessed Sep 2, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-862 | Missing Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Craft CMS | >= 5.0.0-RC1, < 5.10.11 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 2, 2026 | CVE Modified | CISA-ADP |
| Sep 2, 2026 | New CVE Received | [email protected] |