CVE-2026-28509

Published: Mar 6, 2026

Modified: Mar 6, 2026

PUBLISHED

CVSS v3.1

6.3

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.

Vendor	Product	Versions
langbot-app	LangBot	affected `< 4.8.7`

Weaknesses (CWE)

CWE-79

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

References

https://github.com/langbot-app/LangBot/security/advisories/GHSA-w8gq-g4pc-xh3h

x_refsource_CONFIRM

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

x_refsource_MISC

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CVE-2026-28509

Description

Affected Products

Weaknesses (CWE)

CVSS v3.1 Details

References