LangBot — Xss (CVE-2026-28509)
Date: 2026-03
Affected: langbot/langbot
Attack vector: xss
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-28509
CWE: CWE-79
CVSS: 6.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N)

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.


Mitigations:

Architectural layers (MAESTRO):