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CVE-2026-28509

MEDIUM CVSS 3.1: 5.4 EPSS 0.04%
Updated Mar 16, 2026
Langbot
Parameter Value
CVSS 5.4 (MEDIUM)
Affected Versions before 4.8.7
Fixed In 4.8.7
Type CWE-79 (Cross-Site Scripting (XSS))
Vendor Langbot
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
Required
User action required

Impact Assessment

Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption

CVSS Vector v3.1

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Langbot Langbot
cpe:2.3:a:langbot:langbot:*:*:*:*:*:*:*:*
4.8.7