CVE-2026-28509

MEDIUM

6.3

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.

CVE Details

CVSS v3.1 Score6.3

SeverityMEDIUM

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionREQUIRED

Published3/6/2026

Last Modified3/16/2026

Sourcenvd

Honeypot Sightings0

Affected Products

langbot:langbot

Weaknesses (CWE)

CWE-79

References

https://github.com/langbot-app/LangBot/commit/614621ab7b84fe50da3c6137705cde5a99429866(security-advisories@github.com)

https://github.com/langbot-app/LangBot/security/advisories/GHSA-w8gq-g4pc-xh3h(security-advisories@github.com)

IOC Correlations

No correlations recorded

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