What is CVE-2026-39426?

CVE-2026-39426 is a medium-severity vulnerability in 1panel-dev Maxkb, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-14.

How severe is CVE-2026-39426?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in 1panel-dev Maxkb

CVE-2026-39426

MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain a Stored Cross-Site Scripting (XSS) vulnerability where the frontend's MdRenderer.vue component parses custom <iframe_render> tags from LLM responses or…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (9.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

1panel-dev Maxkb — versions < 2.8.0
Maxkb

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-39426?: CVE-2026-39426 is a medium-severity vulnerability in 1panel-dev Maxkb, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-14.
How severe is CVE-2026-39426?: Medium severity. CVSS v3 base score is 5.4 out of 10.