CVE-2021-43847— Authorization Bypass in Space Invite in HumHub
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是一套基于Yii PHP框架编写的开源社交网络软件。 HumHub 存在授权问题漏洞，该漏洞源于在HumHub 1.10.3或1.9.3版本之前，注册用户有可能成为私人空间的未经授权成员。
Possible ATT&CK Techniques 1 AI
T1133 · External Remote Services
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I. Basic Information for CVE-2021-43847
Vulnerability Information
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Vulnerability Title
Authorization Bypass in Space Invite in HumHub
Source: CVE Program / CVE List V5
Vulnerability Description
HumHub is an open-source social network kit written in PHP. Prior to HumHub version 1.10.3 or 1.9.3, it could be possible for registered users to become unauthorized members of private Spaces. Versions 1.10.3 and 1.9.3 contain a patch for this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
HumHub 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Humhub是一套基于Yii PHP框架编写的开源社交网络软件。 HumHub 存在授权问题漏洞，该漏洞源于在HumHub 1.10.3或1.9.3版本之前，注册用户有可能成为私人空间的未经授权成员。
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
II. Public POCs for CVE-2021-43847
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Patches & Fixes for CVE-2021-43847 (1)
-
https://github.com/humhub/humhub/pull/5473 x_refsource_MISC
Vendor Advisories for CVE-2021-43847 (2)
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https://huntr.dev/bounties/943dad83-f0ed-4c74-ba81-7dfce7ca0ef2/ x_refsource_MISC
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https://github.com/humhub/humhub/security/advisories/GHSA-f5hc-5wfr-7v74 x_refsource_CONFIRM
Other References for CVE-2021-43847 (2)
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https://github.com/humhub/humhub/releases/tag/v1.10.3 x_refsource_MISC
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https://github.com/humhub/humhub/releases/tag/v1.9.3 x_refsource_MISC
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HumHub 1.18.4 / 1.18.4-pl1 – Stored Cross-Site Scripting in -
CVE-2026-47657
HumHub Missing Authorization on Remove All Space Members Act
Same vendor: humhub
-
CVE-2026-93769
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CVE-2026-18430
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HumHub Community Edition 1.18.4-pl1 - Reflected XSS in Space -
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CVE-2026-47657
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Same weakness: CWE-285
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V. Comments for CVE-2021-43847
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