Vulnerability · Published Mar 6, 2026 · Assigned by GitHub_M
CVE-2026-28509LangBot has a Cross Site Scripting(XSS) Vulnerability
Medium 6.3
In plain English
A medium-severity cross-site scripting in LangBot from langbot-app. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).
Severity (CVSS 3.1)6.3Medium
Exploit odds (30 days)0.2%top 87.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| langbot-app | LangBot | < 4.8.7 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N