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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
craftcms cms unaffected
Version Status Constraints
5.0.0-RC1 affected < 5.10.11
5.10.11 unaffected —

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Project Subscriptions

Vendors Products
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Craft Cms Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/craftcms/cms/security/advisories/GHSA-329j-cx85-8r56 cve-icon cve-icon
https://www.vulncheck.com/advisories/craft-cms-5.0.0-rc1-before-5.10.11-file-overwrite-via-assets-replace-file cve-icon cve-icon
History

Wed, 02 Sep 2026 11:30:00 +0000

Type Values Removed Values Added
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.
Title Craft CMS 5.0.0-RC1 before 5.10.11 File Overwrite via assets/replace-file
First Time appeared Craftcms
Craftcms craft Cms
Weaknesses CWE-862
CPEs cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*
Vendors & Products Craftcms
Craftcms craft Cms
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-02T13:17:41.009Z

Reserved: 2026-09-02T10:19:06.331Z

Link: CVE-2026-84800

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-09-02T12:17:16.773

Modified: 2026-09-02T13:54:48.797

Link: CVE-2026-84800

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-02T13:00:13Z

Weaknesses