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Maxkb CVE-2026-39423

| EUVD-2026-22184 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-04-14 GitHub_M
XSS Maxkb
6.9
CVSS 4.0 · GitHub Advisory
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GitHub Advisory PRIMARY
6.9 MEDIUM
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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
P
Scope
X

Lifecycle Timeline

7
Patch released
Apr 20, 2026 - 17:34 nvd
Patch available
Patch available
Apr 16, 2026 - 05:29 EUVD
2.8.0
Analysis Generated
Apr 14, 2026 - 01:22 vuln.today
CVSS changed
Apr 14, 2026 - 01:22 NVD
6.9 (MEDIUM)
EUVD ID Assigned
Apr 14, 2026 - 01:15 euvd
EUVD-2026-22184
Analysis Generated
Apr 14, 2026 - 01:15 vuln.today
CVE Published
Apr 14, 2026 - 00:28 nvd
MEDIUM 6.9

DescriptionGitHub Advisory

MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain an Eval Injection vulnerability in the Markdown rendering engine that allows any user capable of interacting with the AI chat interface to execute arbitrary JavaScript in the browsers of other users, including administrators, resulting in Stored Cross-Site Scripting (XSS). This issue has been fixed in version 2.8.0.

AnalysisAI

Stored Cross-Site Scripting (XSS) via Eval Injection in MaxKB's Markdown rendering engine allows authenticated users to execute arbitrary JavaScript in other users' browsers, including administrators. MaxKB versions 2.7.1 and below are affected. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to MaxKB chat
Delivery
Craft Markdown with eval payload
Exploit
Submit malicious message
Execution
Markdown engine evaluates payload
Persist
JavaScript executes in viewer's browser
Impact
Attacker steals or abuses victim privileges
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Vulnerability AssessmentAI

Risk Assessment This is a moderate-to-high-priority vulnerability combining CVSS 6.9 (Medium-High) with strong real-world indicators. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated user crafts a malicious Markdown message containing eval-injectable payload and submits it through the MaxKB chat interface. When an administrator (or any other user) views the chat history, the Markdown renderer evaluates the payload, executing arbitrary JavaScript in their browser context. …
Remediation Vendor-released patch: upgrade MaxKB to version 2.8.0 or later. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-39423 vulnerability details – vuln.today
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