EUVD-2026-22192Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
7DescriptionGitHub Advisory
MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain a Stored Cross-Site Scripting (XSS) vulnerability that allows authenticated users to inject arbitrary HTML and JavaScript into the Application prologue (Opening Remarks) field by wrapping malicious payloads in <html_rander> tags. The backend fails to sanitize or encode HTML entities in the prologue field when applications are created or updated via the /admin/api/workspace/{workspace_id}/application endpoint, storing the raw payload directly in the database. The frontend then renders this content using an innerHTML-equivalent mechanism, trusting <html_rander>-wrapped content to be safe, which enables persistent DOM-based Stored XSS execution against any visitor who opens the affected chatbot interface. Exploitation can lead to session hijacking, unauthorized actions performed on behalf of victims (such as deleting workspaces or applications), and sensitive data exposure. This issue has been fixed in version 2.8.0.
AnalysisAI
Stored Cross-Site Scripting in MaxKB 2.7.1 and below allows authenticated users to inject arbitrary JavaScript into the Application prologue field via <html_rander> tags, which the backend stores unsanitized and the frontend renders with innerHTML-equivalent mechanisms. Exploitation enables session hijacking, unauthorized workspace/application deletion, and sensitive data exposure against any visitor accessing the affected chatbot. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Risk Assessment | CVSS 5.1 (Medium) with network attack vector, low complexity, and low privileges required reflects moderate risk, but real-world impact is elevated due to the stored nature and persistence across all users. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated user with application management permissions (low-privilege access) crafts a POST request to /admin/api/workspace/{workspace_id}/application with a prologue field containing <html_rander><script>fetch('/api/user/logout', {method: 'POST'})</script></html_rander>. The backend stores this raw payload in the database. … |
| Remediation | Vendor-released patch: MaxKB 2.8.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
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