EUVD-2026-41154
GHSA-qh45-9g5p-m2v4
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/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
Network-accessible HTTP endpoint requires low-privilege authentication (PR:L); no confidentiality impact, only limited cross-volume asset deletion affecting integrity and availability.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/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
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Unauthorized cross-volume asset deletion in Craft CMS versions 4.0.0-RC1 through 4.17.13 and 5.0.0-RC1 through 5.9.20 allows any authenticated user with file-replace permission in one volume to permanently delete assets from other volumes where they hold no delete permission. The flaw stems from a PHP ternary operator short-circuit in AssetsController::actionReplaceFile() that bypasses source-volume authorization when both assetId and sourceAssetId parameters are supplied together. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated Craft CMS user account with 'Replace files' permission granted in at least one asset volume. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.3 with vector AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N accurately characterizes a medium-severity issue: network-accessible with low complexity, but gated behind authenticated low-privilege access and limited in scope to partial integrity and availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated Craft CMS editor with 'Replace files' permission in Volume A (e.g., a public uploads volume) but no delete permission in Volume B (e.g., a protected documents archive) opens the media browser to enumerate a valid asset ID in Volume B. The editor then crafts a POST request to the actionReplaceFile endpoint supplying their own asset's ID as assetId and the Volume B asset's ID as sourceAssetId. … |
| Remediation | Vendor-released patch: upgrade Craft CMS v4 installations to 4.17.14 and v5 installations to 5.9.21, as confirmed by the security advisory at https://github.com/craftcms/cms/security/advisories/GHSA-qh45-9g5p-m2v4 and the upstream fix commit at https://github.com/craftcms/cms/commit/2c2579c7f1030872423f268d0c8b48377101961d. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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