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TI-2026-28404 Aliases CVE-2026-39422

MaxKB has Stored XSS via ChatHeadersMiddleware

Priority MEDIUM 64CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00216 12th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed MaxKB (1Panel-dev): 2.8.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
1Panel-devMaxKBbefore 2.8.02.8.0Patch availableCNA
  • MaxKB Vendor1Panel-dev Affected before 2.8.0 Fixed in 2.8.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:maxkb:maxkb:*:*:*:*:-:*:*:*before 2.8.0VulnerableMaxkb
  • cpe:2.3:a:maxkb:maxkb:*:*:*:*:-:*:*:* Versions before 2.8.0 Vulnerable ·Maxkb

Remediation

  • Fix · CNA MaxKB (1Panel-dev) Fixed in 2.8.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-39422

References

Exploit 1

Patch 1

Other 1

  • TI-2023-08712 KubePi's Hardcoded Jwtsigkeys allows malicious actor to login with a forged JWT token CVSS 3.1CRITICAL 9.8
  • TI-2023-08729 KubeOperator is vulnerable to unauthorized access to system API CVSS 3.1CRITICAL 9.8
  • TI-2026-54047 MaxKB: Prompt-injectable agent can lead to command execution CVSS 3.1CRITICAL 10.0
  • TI-2025-43180 CordysCRM 1.4.1 is vulnerable to SQL Injection in the employee list query interface… CVSS 3.1CRITICAL 9.8
  • TI-2024-27040 Arbitrary File Read in Ansible Playbooks in Jumpserver CVSS 3.1CRITICAL 10.0
  • TI-2024-26801 a sqlinjection in 1Panel CVSS 3.1CRITICAL 9.8
See all 145 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences