Vulnerability Details CVE-2026-39422
MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain a Stored Cross-Site Scripting (XSS) vulnerability through the application name or icon fields when creating an application. When a victim visits the public chat interface (/ui/chat/{access_token}), the ChatHeadersMiddleware retrieves the application data and directly inserts the unescaped application name and icon into the HTML response via string replacement. This allows an attacker to execute arbitrary JavaScript in the victim's browser context. This issue has been fixed in version 2.8.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 15.1%
CVSS Severity
CVSS v3 Score 5.4
References
Products affected by CVE-2026-39422
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cpe:2.3:a:maxkb:maxkb:0.9.0
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cpe:2.3:a:maxkb:maxkb:0.9.1
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cpe:2.3:a:maxkb:maxkb:1.0.0
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cpe:2.3:a:maxkb:maxkb:1.0.1
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cpe:2.3:a:maxkb:maxkb:1.0.2
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cpe:2.3:a:maxkb:maxkb:1.0.3
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cpe:2.3:a:maxkb:maxkb:1.0.4
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cpe:2.3:a:maxkb:maxkb:1.1.0
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cpe:2.3:a:maxkb:maxkb:1.1.1
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cpe:2.3:a:maxkb:maxkb:1.1.2
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cpe:2.3:a:maxkb:maxkb:1.1.3
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cpe:2.3:a:maxkb:maxkb:1.2.0
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cpe:2.3:a:maxkb:maxkb:1.2.1
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cpe:2.3:a:maxkb:maxkb:1.3.0
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cpe:2.3:a:maxkb:maxkb:1.3.1
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cpe:2.3:a:maxkb:maxkb:1.4.0
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cpe:2.3:a:maxkb:maxkb:1.4.1
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cpe:2.3:a:maxkb:maxkb:1.5.0
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cpe:2.3:a:maxkb:maxkb:1.5.1
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cpe:2.3:a:maxkb:maxkb:1.6.0
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cpe:2.3:a:maxkb:maxkb:1.6.1
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cpe:2.3:a:maxkb:maxkb:1.7.0
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cpe:2.3:a:maxkb:maxkb:1.7.1
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cpe:2.3:a:maxkb:maxkb:1.7.2
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cpe:2.3:a:maxkb:maxkb:1.8.0
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cpe:2.3:a:maxkb:maxkb:1.8.1
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cpe:2.3:a:maxkb:maxkb:1.9.0
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cpe:2.3:a:maxkb:maxkb:1.9.1
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cpe:2.3:a:maxkb:maxkb:2.0.1
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cpe:2.3:a:maxkb:maxkb:2.0.2
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cpe:2.3:a:maxkb:maxkb:2.1.0
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cpe:2.3:a:maxkb:maxkb:2.1.1
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cpe:2.3:a:maxkb:maxkb:2.1.2
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cpe:2.3:a:maxkb:maxkb:2.2.0
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cpe:2.3:a:maxkb:maxkb:2.2.1
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cpe:2.3:a:maxkb:maxkb:2.3.0
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cpe:2.3:a:maxkb:maxkb:2.3.1