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CVE-2026-84800— Craft CMS 5.0.0-RC1 before 5.10.11 File Overwrite via assets/replace-file

Quick assessment

Affected
craftcms cms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Craft CMS是Craft CMS公司的一套内容管理系统(CMS)。 Craft CMS 5.0.0-RC1版本至5.10.11之前版本存在授权问题漏洞，该漏洞源于AssetsController::actionReplaceFile存在缺失的授权验证，当请求提供sourceAssetId和targetFilename但省略assetId时，目标资产在权限检查执行后通过文件夹和文件名解析，导致replacePeerFiles权限未被执行，可能使经过身份验证的低权限作者仅凭共享文件夹的replaceFi

CVSS 7.1 · High EPSS 0.35% · P28

Possible ATT&CK Techniques 1 AI

T1565 · Data Manipulation

Affected Version Matrix 2

VendorProduct Version RangeStatus
craftcms cms 5.0.0-RC1< 5.10.11 affected
5.10.11 unaffected
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I. Basic Information for CVE-2026-84800

Vulnerability Information
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Vulnerability Title
Craft CMS 5.0.0-RC1 before 5.10.11 File Overwrite via assets/replace-file
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Craft CMS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Craft CMS是Craft CMS公司的一套内容管理系统(CMS)。 Craft CMS 5.0.0-RC1版本至5.10.11之前版本存在授权问题漏洞，该漏洞源于AssetsController::actionReplaceFile存在缺失的授权验证，当请求提供sourceAssetId和targetFilename但省略assetId时，目标资产在权限检查执行后通过文件夹和文件名解析，导致replacePeerFiles权限未被执行，可能使经过身份验证的低权限作者仅凭共享文件夹的replaceFi
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
craftcms cms 5.0.0-RC1 ~ 5.10.11 -

II. Public POCs for CVE-2026-84800

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III. Intelligence Information for CVE-2026-84800

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Vendor Advisories for CVE-2026-84800 (2)

Same Patch Batch · craftcms · 2026-09-02 · 14 CVEs total

CVE-2026-84795 9.8 CRITICAL Craft CMS before 5.10.11 Authentication Bypass via Admin Flag Inheritance
CVE-2026-84801 8.8 HIGH Craft CMS 5.0.0-RC1 before 5.10.11 Authentication Bypass via administrateUsers
CVE-2026-84796 8.8 HIGH Craft CMS 5.0.0-RC1 before 5.10.11 GraphQL Entry Mutation Site Scope Bypass
CVE-2026-79989 8.7 HIGH Arbitrary user password reset leading to administrator account takeover
CVE-2026-79990 8.7 HIGH GQL entry mutation `siteId` bypasses schema site scope, enabling cross-site content read/w
CVE-2026-84794 7.1 HIGH Craft CMS 5.0.0 through 5.10.10 Authorization Bypass via assets/move-asset
CVE-2026-84798 7.1 HIGH Craft CMS before 5.10.11 Authorization Bypass via actionDeleteForSite
CVE-2026-79991 7.1 HIGH Authenticated SQL Injection via nested eager-loading criteria
CVE-2026-84797 6.3 MEDIUM Craft CMS 5.0.0-RC1 before 5.10.11 Authorization Bypass via actionDuplicate
CVE-2026-84793 4.8 MEDIUM Craft CMS 5.0.0-RC1 before 5.10.11 Stored XSS via site name
CVE-2026-84792 4.3 MEDIUM Craft CMS before 5.10.11 Broken Access Control via element-indexes
CVE-2026-84802 4.3 MEDIUM Craft CMS 5.7.0 before 5.10.12 Information Disclosure via AssetsController
CVE-2026-84799 4.3 MEDIUM Craft CMS before 5.11.0 PII Disclosure via GraphQL User Relations

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-862