CVE-2026-39422

MEDIUM EPSS 12.0%
Published Apr 14, 20262mo ago · Modified Jun 17, 20261w ago
6.9 CVSS 4.0
Medium
Find Similar
Published Apr 14, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score
6.9
Exploitability
—
Impact
—
Vector string
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

Threat Intelligence

EPSS Exploit Probability
12.0% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 1

VendorProductVersionRange
maxkbmaxkb* <2.8.0

References 3

  • github.com https://github.com/1Panel-dev/MaxKB/commit/026a2d623e2aa5efa67c4834651e79d5d7cab1da
    Patch
  • github.com https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0
    Release Notes
  • github.com https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-wf7p-3jq5-q52w
    ExploitVendor Advisory

Remediation

  • github.com https://github.com/1Panel-dev/MaxKB/commit/026a2d623e2aa5efa67c4834651e79d5d7cab1da
    Patch