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OpenAdvisories
Medium · 6.3 CVE-2026-28509 EUVD-2026-9985

LangBot has a Cross Site Scripting(XSS) Vulnerability

Published Mar 6, 2026 · Updated Mar 6, 2026 · Assigned by GitHub_M

Description

LangBot is a global IM bot platform designed for LLMs. Prior to version 4.8.7, LangBot’s web UI renders user-supplied raw HTML using rehypeRaw, which can lead to a cross-site scripting (XSS) vulnerability. This issue has been patched in version 4.8.7.

Affected products

VendorProductAffectedFixed
langbot-app LangBot < 4.8.7 —

References