CVE-2026-28509: LangBot has a Cross Site Scripting(XSS) Vulnerability
Published Mar 6, 2026
·Updated
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.
Affected Software
2 affected components
LangBot LangBot<4.8.7
LangBot LangBot<4.8.7
Remediation
Event History
Mar 6, 2026
CVE Published
via MITRE·04:16 AM
Data Sourced
via MITRE·04:16 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·05:16 AM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-28509?
CVE-2026-28509 is classified as a high severity cross-site scripting (XSS) vulnerability.
2
How do I fix CVE-2026-28509?
To fix CVE-2026-28509, upgrade LangBot to version 4.8.7 or later.
3
What software is affected by CVE-2026-28509?
CVE-2026-28509 affects LangBot versions prior to 4.8.7.
4
What type of vulnerability is CVE-2026-28509?
CVE-2026-28509 is a cross-site scripting (XSS) vulnerability.
5
What is the impact of CVE-2026-28509?
CVE-2026-28509 can allow attackers to inject malicious scripts into web pages viewed by other users.