CVE-2026-39422
MaxKB has Stored XSS via ChatHeadersMiddleware
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.
INFO
Published Date :
April 14, 2026, 1:16 a.m.
Last Modified :
April 20, 2026, 5:34 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update MaxKB to version 2.8.0.
- Review application creation inputs.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-39422.
| URL | Resource |
|---|---|
| https://github.com/1Panel-dev/MaxKB/commit/026a2d623e2aa5efa67c4834651e79d5d7cab1da | Patch |
| https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0 | Release Notes |
| https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-wf7p-3jq5-q52w | Exploit Vendor Advisory |
| https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-wf7p-3jq5-q52w | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-39422 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-39422
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-39422 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-39422 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:maxkb:maxkb:*:*:*:*:-:*:*:* versions up to (excluding) 2.8.0 Added Reference Type GitHub, Inc.: https://github.com/1Panel-dev/MaxKB/commit/026a2d623e2aa5efa67c4834651e79d5d7cab1da Types: Patch Added Reference Type GitHub, Inc.: https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-wf7p-3jq5-q52w Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-wf7p-3jq5-q52w Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 14, 2026
Action Type Old Value New Value Added Reference https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-wf7p-3jq5-q52w -
New CVE Received by [email protected]
Apr. 14, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CWE CWE-79 Added Reference https://github.com/1Panel-dev/MaxKB/commit/026a2d623e2aa5efa67c4834651e79d5d7cab1da Added Reference https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0 Added Reference https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-wf7p-3jq5-q52w