CVE-2026-112265

Medium

Description

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductLangBot

PublishedOct 19, 2026

First seenOct 19, 2026

Weakness typeCWE-345CWE-345

How to fix

Patches

github.com/langbot-app/LangBot/commit/43c481d74a6388657b84baa7d292c613c75c24f9

Affected products

Product	Affected versions	Fixed in
langbot-app LangBot	v ≤ 4.11.0	—

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