{"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","slug":"CVE-2026-112265","body":"## Overview\n\nLangBot 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.\n\n## Affected\n\n- `LangBot <= 4.11.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}