Vulnerability · Published Apr 14, 2026 · Assigned by GitHub_M

CVE-2026-39422MaxKB has Stored XSS via ChatHeadersMiddleware

Medium 6.9

In plain English

A medium-severity cross-site scripting in MaxKB from 1Panel-dev. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.2%top 87.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
1Panel-dev	MaxKB	< 2.8.0

Weakness: CWE-79 · Vector: 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

References

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