CVE-2026-112265CWE-345

CVE-2026-112265

Medium · published October 19, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
4.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
CVSS v4.0
8.3 · 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
EPSS
0.00154 · 4.1th percentile
Weakness
CWE-345 · Insufficient Verification of Data Authenticity
Published
2026-10-19T18:17Z
References (6)
https://github.com/langbot-app/LangBot/blob/v4.11.0/src/langbot/pkg/api/http/controller/groups/webhooks.py · [email protected]https://github.com/langbot-app/LangBot/blob/v4.11.0/src/langbot/pkg/platform/adapters/lark/adapter.py · [email protected]https://github.com/langbot-app/LangBot/blob/v4.11.0/src/langbot/pkg/platform/sources/lark.py · [email protected]https://github.com/langbot-app/LangBot/commit/43c481d74a6388657b84baa7d292c613c75c24f9 · [email protected]https://github.com/langbot-app/LangBot/issues/2627 · [email protected]https://www.vulncheck.com/advisories/langbot-through-4.11.0-missing-lark-feishu-webhook-authenticity-verification · [email protected]
EPSS history
Timeline
  • 21 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 19 OCT 13:55Z
    LangBot through 4.11.0 Missing Lark/Feishu Webhook Authenticity Verification
    cvelistv5
  • 19 OCT 13:55Z
    LangBot through 4.11.0 Missing Lark/Feishu Webhook Authenticity Verification
    cvelistv5