CVE-2026-50283
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk18th percentile — higher than 18% of all known CVEs
Summary
Craft CMS has an authorization issue in AssetsController::actionReplaceFile that allows an authenticated user to delete a source asset without source delete permission. Affected versions are 5.0.0-RC1 through 5.9.20 and 4.0.0-RC1 through 4.17.13.
Risk Assessment
An attacker can delete files in a volume where they lack delete permissions, causing data loss and broken content references.
Recommendation
Upgrade Craft CMS to version 4.17.14 or 5.9.21 immediately to fix the vulnerability.
Original NVD description (English source)
Craft CMS is a content management system (CMS). Versions 5.0.0-RC1 through 5.9.20, and 4.0.0-RC1 through 4.17.13 contain an authorization issue in the AssetsController::actionReplaceFile that can delete a source asset without source delete permission by supplying both assetId and sourceAssetId. AssetsController::actionReplaceFile() supports replacing a target asset file using another existing asset as the source. The action loads: assetId -> $assetToReplace and sourceAssetId -> $sourceAsset, then enforces replace permissions using ($assetToReplace ?: $sourceAsset). When both IDs are provided, this expression resolves to the target asset so no permission check is performed against the source asset volume. When both assets are present, Craft copies the source file into the target and then deletes the source asset. There is no deletion check for for the source asset. An authenticated user who can replace files in one volume can delete assets in another volume where they do not have delete permission, as long as they can obtain a sourceAssetId, leading to broken content references and data loss. This issue has been fixed in versions 4.17.14 and 5.9.21.