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CVE-2026-39422

MaxKB has Stored XSS via ChatHeadersMiddleware

Published: Apr 14, 2026Updated: Apr 20, 2026 Sources: CVE List NVDCWE-79
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.2%
Top 88.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:LUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

MaxKB1Panel-dev
On-prem
Cloud & SaaS / cloud-platform
maxkbmaxkb
On-prem
Enterprise Software / collaboration-groupware
1panel-devoss-projectCNCloud & SaaSaka 1panel
maxkbEnterprise Softwareaka maxkb

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

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

Timeline

Published
Apr 14, 2026
Last Updated
Apr 20, 2026

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