CVE-2026-112265
CVE-2026-112265 · LangBot through 4.11.0 Missing Lark/Feishu Webhook Authenticity Verification
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.3 · High · EPSS 0.2%
- Published
- Updated
Affected products and versions
langbot
- Versions
- ≥ 0, ≤ 4.11.0: Affected (custom)
No fix published
Original sources
- https://github.com/langbot-app/LangBot/issues/2627
- https://github.com/langbot-app/LangBot/commit/43c481d74a6388657b84baa7d292c613c75c24f9
- https://github.com/langbot-app/LangBot/blob/v4.11.0/src/langbot/pkg/platform/adapters/lark/adapter.py
- https://github.com/langbot-app/LangBot/blob/v4.11.0/src/langbot/pkg/platform/sources/lark.py
- https://github.com/langbot-app/LangBot/blob/v4.11.0/src/langbot/pkg/api/http/controller/groups/webhooks.py
- https://www.vulncheck.com/advisories/langbot-through-4.11.0-missing-lark-feishu-webhook-authenticity-verification
- https://nvd.nist.gov/vuln/detail/CVE-2026-112265