Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/craftcms/cms/commit/2c2579c7f1030872423f268d0c8b48377101961d
- https://github.com/craftcms/cms/security/advisories/GHSA-qh45-9g5p-m2v4
FAQ
What is CVE-2026-50283?
CVE-2026-50283 is a documented vulnerability. 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 dele...
How severe is CVE-2026-50283?
CVSS scoring is not yet available for CVE-2026-50283. Check NVD for updates.
Is there a patch for CVE-2026-50283?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.