Humhub
CVE-2026-29048
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS 6.1 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: Required. Exploitable via remote/network. |
| Exploit ScenarioDerived | A remote attacker could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Cross-site scripting in HumHub 1.18.0's Button component allows unauthenticated attackers to inject and execute malicious scripts in users' browsers through inconsistent output encoding. Affected users could have their sessions compromised or be redirected to malicious content without any user interaction beyond visiting a crafted page. A patch is available in version 1.18.1.
Earlier versions of this analysis (1)
HumHub is an Open Source Enterprise Social Network. In version 1.18.0, a cross-site scripting vulnerability was identified in the Button component of version 1.18.0. [CVSS 6.1 MEDIUM]
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 1.18.1.. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-79 (Cross-site Scripting (XSS)). Affects the Button component of Humhub. HumHub is an Open Source Enterprise Social Network. In version 1.18.0, a cross-site scripting vulnerability was identified in the Button component of version 1.18.0. Due to inconsistent output encoding at several points within the software, malicious scripts could be injected and executed in the context of the user's browser. This issue has been patched in version 1.18.1.
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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:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
2DescriptionGitHub Advisory
HumHub is an Open Source Enterprise Social Network. In version 1.18.0, a cross-site scripting vulnerability was identified in the Button component of version 1.18.0. Due to inconsistent output encoding at several points within the software, malicious scripts could be injected and executed in the context of the user's browser. This issue has been patched in version 1.18.1.
Executive ViewAI
Organizations using the Button component of should be aware of moderate risk from CVE-2026-29048, a cross-site scripting vulnerability rated CVSS 6.1. Attackers could inject scripts to steal sessions or perform actions as authenticated users. A patch is available and should be applied during regular vulnerability management.
Apply vendor patch. If patching is delayed: implement CSP headers, enable HttpOnly cookies, deploy WAF XSS rules.
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
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)GitHub Advisory
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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
Exploit-DB