---
id: CVE-2026-112265
title: LangBot through 4.11.0 Missing Lark/Feishu Webhook Authenticity Verification
summary: >-
  LangBot through 4.11.0 contains a missing authenticity verification
  vulnerability that allows unauthenticated attackers to inject forged
  Lark/Feishu events by skipping signature checks. Attackers knowing a bot UUID
  can POST fabricated im…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-345
vendor: langbot-app
product: LangBot
affected:
  - LangBot <= 4.11.0
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T13:55:15.112Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-112265'
references:
  - url: 'https://github.com/langbot-app/LangBot/issues/2627'
  - url: >-
      https://github.com/langbot-app/LangBot/commit/43c481d74a6388657b84baa7d292c613c75c24f9
  - url: >-
      https://github.com/langbot-app/LangBot/blob/v4.11.0/src/langbot/pkg/platform/adapters/lark/adapter.py
  - url: >-
      https://github.com/langbot-app/LangBot/blob/v4.11.0/src/langbot/pkg/platform/sources/lark.py
  - url: >-
      https://github.com/langbot-app/LangBot/blob/v4.11.0/src/langbot/pkg/api/http/controller/groups/webhooks.py
  - url: >-
      https://www.vulncheck.com/advisories/langbot-through-4.11.0-missing-lark-feishu-webhook-authenticity-verification
    label: >-
      VulnCheck Advisory: LangBot through 4.11.0 Missing Lark/Feishu Webhook
      Authenticity Verification
tags:
  - cve.org
ingestedAt: '2026-10-19T14:30:01.075Z'
---

## Overview

LangBot through 4.11.0 contains a missing authenticity verification vulnerability that allows unauthenticated attackers to inject forged Lark/Feishu events by skipping signature checks. Attackers knowing a bot UUID can POST fabricated im.message.receive_v1 or card.action.trigger events to drive the LLM pipeline, tools, and approvals as other users.

## Affected

- `LangBot <= 4.11.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.