PT-2026-23641 · Langbot · Langbot

Junwonheo · CVE-2026-28509 · Published 2026-03-06 · Updated 2026-03-16

Positive Technologies (AI Summary)

CVSS v3.1

6.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions LangBot versions prior to 4.8.7

Description LangBot is a global IM bot platform designed for LLMs. Prior to version 4.8.7, the web UI renders user-supplied raw HTML using rehypeRaw, which can lead to a cross-site scripting (XSS) issue.

Recommendations Update to version 4.8.7 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-28509

GHSA-W8GQ-G4PC-XH3H

Affected Products

Langbot

References · 7

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28509.json · Exploit
• https://github.com/langbot-app/LangBot/commit/614621ab7b84fe50da3c6137705cde5a99429866 · Patch
• https://github.com/langbot-app/LangBot/security/advisories/GHSA-w8gq-g4pc-xh3h · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-28509 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-28509 · Security Note
• https://t.me/cveNotify/155498 · Telegram Post
• https://t.me/CVEtracker/46544 · Telegram Post