CVE-2026-28509
Medium
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.
SeverityMedium
CVSS6.3
Exploit probability—
ProductLangbot
PublishedMar 6, 2026
First seenMar 6, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- langbot langbot4.8.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| langbot langbot | v < 4.8.7 | 4.8.7 |
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