Vulnerability in Langbot-App Langbot
CVE-2026-112265
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/langbot-app/LangBot/issues/2627 (issue-tracking)
- github.com/langbot-app/LangBot/commit/43c481d74a6388657b84baa7d292c613c75c24f9 (patch)
- github.com/langbot-app/LangBot/blob/v4.11.0/src/langbot/pkg/platform/adapters/l… (technical-description)
- github.com/langbot-app/LangBot/blob/v4.11.0/src/langbot/pkg/platform/sources/la… (technical-description)
- github.com/langbot-app/LangBot/blob/v4.11.0/src/langbot/pkg/api/http/controller… (technical-description)
- www.vulncheck.com/advisories/langbot-through-4.11.0-missing-lark-feishu-webhook… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-112265?
- CVE-2026-112265 is a medium-severity vulnerability in Langbot-App Langbot, classified under Insufficient Verification of Data Authenticity. CVSS score: 6.5/10. Published 2026-10-19.
- How severe is CVE-2026-112265?
- Medium severity. CVSS v3 base score is 6.5 out of 10.