cvedb.io
CVE-2026-39426
MEDIUM · CVSS 5.4
EPSS exploitation probability: 0%
Published 2026-04-14T02:16:05.460 · Last modified 2026-06-17T10:42:06.063

Summary

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 Application Prologue configurations, bypassing standard Markdown sanitization and XSS filtering. The unsanitized HTML content is passed to the IframeRender.vue component, which renders it directly into an <iframe> via the srcdoc attribute configured with sandbox="allow-scripts allow-same-origin". This can be a dangerous combination, allowing injected scripts to escape the iframe and execute JavaScript in the parent window using window.parent. Since the Prologue is rendered for any user visiting an application's chat interface, this results in a high-impac

Affected products

maxkb — maxkb

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.