Medium 6.9Published Apr 13, 2026

CVE-2026-39422MaxKB has Stored XSS via ChatHeadersMiddleware

Updated under an hour ago (Oct 26, 2026, 5:10 PM ET)

Does this affect you?

It affects 1Panel-dev MaxKB and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for 1Panel-dev MaxKB

Exploited in the last 30 days

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: 6.9 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

1Panel-dev MaxKB 1panel_dev:maxkb (from the name)	before 2.8.0	CNA record
maxkb maxkb maxkb:maxkb	before 2.8.0	NVD

References

References

https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-wf7p-3jq5-q52w	x-refsource-confirm, exploit, vendor-advisory
https://github.com/1Panel-dev/MaxKB/commit/026a2d623e2aa5efa67c4834651e79d5d7cab1da	x-refsource-misc, patch
https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.