Humhub
CVE-2021-43847
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Authorization verification
MITRE ATT&CK
1 technique across 1 tactic: Defense Evasion The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 6.5 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required. Public proof-of-concept exploit code is available. |
| Exploit ScenarioDerived | This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system. |
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Alert meAnalysisAI
HumHub is an open-source social network kit written in PHP. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
Affects your stack
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Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified under CWE-285. 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. Affected products include: Humhub. Version information: version 1.10.3.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Primary rating from Vendor (github) · only source for this CVE.
CVSS VectorVendor: github
DescriptionCVE.org
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.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
Affected Products (CPE)CVE.org
SQL injection vulnerability in the actionIndex function in protected/modules_core/notification/controllers/ListControlle
HumHub is an Open Source Enterprise Social Network. Rated medium severity (CVSS 6.5), this vulnerability is remotely exp
A cross-site scripting (XSS) vulnerability in HumHub 1.3.12 allows remote attackers to inject arbitrary web script or HT
Files is a module for managing files inside spaces and user profiles. Rated critical severity (CVSS 9.2), this vulnerabi
Stored XSS in HumHub Community Edition 1.18.4 and 1.18.4-pl1 allows authenticated low-privilege users to inject arbitrar
Stored cross-site scripting in HumHub 1.18.4 lets a Space administrator embed arbitrary HTML or JavaScript into the dele
Reflected cross-site scripting in HumHub Community Edition 1.18.4 allows a low-privileged attacker to inject arbitrary J
Stored cross-site scripting in HumHub 1.18.5 lets an authenticated user who holds the delegated, non-system-administrato
Broken access control in HumHub 1.13.0 through 1.18.2 lets any authenticated user delete every member of any Space, rega
HumHub Calendar module versions prior to 1.8.11 contain a stored XSS vulnerability in Event Types that allows attackers
Generation of Error Message Containing Sensitive Information in HumHub GmbH & Co. Rated medium severity (CVSS 6.9), this
Cross-site scripting in HumHub 1.18.0's Button component allows unauthenticated attackers to inject and execute maliciou
Exploit-DB