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CVE-2026-47657— HumHub Missing Authorization on Remove All Space Members Action

Quick assessment

Affected
humhub humhub
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.

HumHub是HumHub组织开源的一套基于Yii PHP框架编写的开源社交网络软件。 HumHub 1.13.0版本至1.18.2版本存在授权问题漏洞，该漏洞源于Space member management controller中缺少授权检查，可能导致任何身份验证的用户触发从任何Space中移除所有成员的操作。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.36% · P28

Affected Version Matrix 1

VendorProduct Version RangeStatus
humhub humhub >= 1.13.0, < 1.18.3 affected
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I. Basic Information for CVE-2026-47657

Vulnerability Information
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Vulnerability Title
HumHub Missing Authorization on Remove All Space Members Action
Source: CVE Program / CVE List V5
Vulnerability Description
HumHub is an Open Source Enterprise Social Network. In versions 1.13.0 through 1.18.2, a missing authorization check in the Space member management controller allowed any authenticated user to trigger the removal of all members from any Space, regardless of their own role or membership in that Space. Versions 1.13.0 through 1.18.2 are affected. The vulnerability has been patched in version 1.18.3, and all users are encouraged to upgrade to this version or later immediately. No known workaround is available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
HumHub 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HumHub是HumHub组织开源的一套基于Yii PHP框架编写的开源社交网络软件。 HumHub 1.13.0版本至1.18.2版本存在授权问题漏洞，该漏洞源于Space member management controller中缺少授权检查，可能导致任何身份验证的用户触发从任何Space中移除所有成员的操作。
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
humhub humhub >= 1.13.0, < 1.18.3 -

II. Public POCs for CVE-2026-47657

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III. Intelligence Information for CVE-2026-47657

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Patches & Fixes for CVE-2026-47657 (2)

IV. Related Vulnerabilities

Same product: humhub
Same vendor: humhub
Same weakness: CWE-862

V. Comments for CVE-2026-47657

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