CVE-2026-112265

LangBot through 4.11.0 Missing Lark/Feishu Webhook Authenticity Verification

Published Oct 19, 2026 CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title LangBot through 4.11.0 Missing Lark/Feishu Webhook Authenticity Verification
First Time appeared Langbot
Langbot langbot
Weaknesses CWE-345
CPEs cpe:2.3:a:langbot:langbot:*:*:*:*:*:*:*:*
Vendors & Products Langbot
Langbot langbot
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N'}

cvssV4_0

{'score': 8.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 19, 2026, 4:35 PM
Reserved
Oct 19, 2026, 1:25 PM
Status
Deferred
Published
Oct 19, 2026, 2:17 PM
Modified
Oct 19, 2026, 5:17 PM