CVE-2026-28509CWE-79

LangBot has a Cross Site Scripting(XSS) Vulnerability

Medium · published March 6, 2026

CVSS v3.1
6.3
EPSS
0%
Percentile
19.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00283 · 19.7th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-03-06T04:16Z
EPSS history
Timeline
  • 06 MAR 04:16Z
    LangBot has a Cross Site Scripting(XSS) Vulnerability
    cvelistv5