Executive Summary

[{'type': 'paragraph', 'content': "CVE-2026-29048 is a Cross-Site Scripting (XSS) vulnerability found in the Button component of HumHub version 1.18.0. The issue occurs due to inconsistent output encoding at several points within the software, which allows attackers to inject and execute malicious scripts in the context of the user's browser."}, {'type': 'paragraph', 'content': "This vulnerability arises because labels for UI components such as Buttons, Links, Badges, and DropdownMenus were not properly encoded, enabling malicious scripts to be embedded in these labels and executed when rendered in the user's browser."}, {'type': 'paragraph', 'content': 'The vulnerability was fixed by ensuring that these UI element labels are properly HTML-encoded by default, sanitizing user-controllable inputs and preventing script injection.'}] [1, 2, 4]

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Impact Analysis

[{'type': 'paragraph', 'content': "This Cross-Site Scripting (XSS) vulnerability can allow attackers to inject malicious scripts that execute in the context of a user's browser when interacting with the affected HumHub application."}, {'type': 'paragraph', 'content': "Such script execution can lead to unauthorized actions on behalf of the user, theft of sensitive information such as session tokens or credentials, and potentially compromise the user's account or data."}, {'type': 'paragraph', 'content': 'Since the vulnerability affects the user interface components, any user interacting with the vulnerable version (1.18.0) of HumHub could be exposed to these risks.'}, {'type': 'paragraph', 'content': 'Upgrading to version 1.18.1 or later mitigates this risk by applying proper encoding to UI labels.'}] [1, 2]

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Compliance Impact

I don't know

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Detection Guidance

I don't know

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'To mitigate the CVE-2026-29048 vulnerability, you should upgrade HumHub from version 1.18.0 to version 1.18.1 or later, as the vulnerability has been patched in version 1.18.1.'}, {'type': 'paragraph', 'content': 'The patch involves proper HTML encoding of UI component labels such as Buttons, Links, Badges, and DropdownMenus to prevent Cross-Site Scripting (XSS) attacks by sanitizing user-controllable inputs.'}, {'type': 'paragraph', 'content': "Applying this update will ensure that malicious scripts cannot be injected and executed in the user's browser context via the Button component or similar UI elements."}] [2, 3, 4]

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