CVE-2026-28509

PoC —

CVSS 3.1

5.4 medium

EPSS

<1%p8

Published

Mar 6, 2026 (Mar 6, 2026)

Modified

Jun 17, 2026

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.

Vendors: langbot
Products: langbot
Weakness: CWE-79
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.2%)

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