CVE-2026-28509 | THREATINT

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.

PUBLISHED Reserved 2026-02-27 | Published 2026-03-06 | Updated 2026-03-06 | Assigner GitHub_M

MEDIUM: 6.3CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

< 4.8.7

affected

References

github.com/...angBot/security/advisories/GHSA-w8gq-g4pc-xh3h

github.com/...ommit/614621ab7b84fe50da3c6137705cde5a99429866

cve.org (CVE-2026-28509)

nvd.nist.gov (CVE-2026-28509)

Download JSON