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CVE-2026-50279— Craft CMS: Authorship spoofing in `entries/save-entry` via pre-check/post-mutation authorization gap

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.

CraftCMS cms是CraftCMS的内容管理系统。 Craft CMS 5.0.0-RC1版本至5.9.21之前版本存在授权问题漏洞，该漏洞源于权限验证问题，可能导致低权限用户在未持有专门作者权限的情况下，通过接受攻击者提供的作者参数进行作者伪冒。

AI Predicted 6.5 Difficulty: Easy EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1136 · Create Account

Affected Version Matrix 1

VendorProduct Version RangeStatus
craftcms cms >= 5.0.0-RC1, < 5.9.21 affected
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I. Basic Information for CVE-2026-50279

Vulnerability Information
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Vulnerability Title
Craft CMS: Authorship spoofing in `entries/save-entry` via pre-check/post-mutation authorization gap
Source: CVE Program / CVE List V5
Vulnerability Description
Craft CMS is a content management system (CMS). IN versions 5.0.0-RC1 and above prior to 5.9.21, theEntriesController::actionSaveEntry() performs entry-edit permission checks before request-controlled author changes are applied to the model, allowing for authorship spoofing. The subsequent author mutation path accepts attacker-supplied authors / author parameters and allows the change when the current user is one of the old authors. Because the controller does not re-run authorization after mutating the author list, a low-privileged user can reassign an entry’s authorship to another user without holding the dedicated peer-author-change permission. This issue has been fixed in version 5.9.21.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Craft CMS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CraftCMS cms是CraftCMS的内容管理系统。 Craft CMS 5.0.0-RC1版本至5.9.21之前版本存在授权问题漏洞，该漏洞源于权限验证问题，可能导致低权限用户在未持有专门作者权限的情况下，通过接受攻击者提供的作者参数进行作者伪冒。
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, < 5.9.21 -

II. Public POCs for CVE-2026-50279

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III. Intelligence Information for CVE-2026-50279

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Patches & Fixes for CVE-2026-50279 (1)

Vendor Advisories for CVE-2026-50279 (1)

Same Patch Batch · craftcms · 2026-07-01 · 9 CVEs total

CVE-2026-50284 Craft CMS: Missing peer-permission check in `AssetsController::actionDeleteFolder` allows
CVE-2026-50280 Craft CMS: Authorization bypass in `entries/move-to-section` via missing target-section sa
CVE-2026-50283 Craft CMS: Unauthorized Deletion of Source Assets During File Replacement
CVE-2026-55793 Craft CMS: Stored XSS via Structure entry title in table view
CVE-2026-55790 Craft CMS: DOM XSS via GitHub issue title in CraftSupport widget
CVE-2026-55792 Craft CMS: Sensitive File Disclosure / Server-Side File Read
CVE-2026-55791 Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in acti
CVE-2026-55794 Craft CMS: Potential authenticated Remote Code Execution via referrer redirect

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-285

V. Comments for CVE-2026-50279

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