CVE-2026-28509

MEDIUM EPSS 8.5%
Published Mar 6, 20264mo ago · Modified Mar 16, 20263mo ago
5.4 CVSS 3.1
Medium
Find Similar
Published Mar 6, 2026 4mo ago
Last Modified Mar 16, 2026 3mo ago

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.

CVSS Details

Base Score
5.4
Exploitability
2.3
Impact
2.7
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
8.5% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 1

VendorProductVersionRange
langbotlangbot* <4.8.7

References 2

  • github.com https://github.com/langbot-app/LangBot/commit/614621ab7b84fe50da3c6137705cde5a99429866
    Patch
  • github.com https://github.com/langbot-app/LangBot/security/advisories/GHSA-w8gq-g4pc-xh3h
    ExploitVendor Advisory

Remediation

  • github.com https://github.com/langbot-app/LangBot/commit/614621ab7b84fe50da3c6137705cde5a99429866
    Patch