CVE-2026-28509

MEDIUM

langbot < 4.8.7 - Cross-Site Scripting via rehypeRaw HTML Rendering

Title source: llm
STIX 2.1

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.

References (2)

Core 2

Scores

CVSS v3 6.3
EPSS 0.0004
EPSS Percentile 13.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (1)
langbot/langbot < 4.8.7
Published Mar 06, 2026
Tracked Since Mar 06, 2026