CVE-2026-34509
Sender Allowlist Bypass in OpenClaw Microsoft Teams Plugin
Publication date: 2026-03-31
Last updated on: 2026-04-01
Assigner: VulnCheck
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| openclaw | openclaw | to 2026.3.8 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-863 | The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in OpenClaw versions before 2026.3.8, specifically in its Microsoft Teams plugin. It is a sender allowlist bypass issue where unauthorized senders can bypass the intended authorization checks. When a team or channel route allowlist is configured with an empty groupAllowFrom parameter, the message handler incorrectly synthesizes a wildcard sender authorization. This means that any sender in the matched team or channel can trigger replies in allowlisted Teams routes, even if they are not explicitly authorized.
How can this vulnerability impact me? :
The impact of this vulnerability is that unauthorized users can send messages that trigger replies in Microsoft Teams routes that are supposed to be restricted. This could lead to unauthorized communication or actions within Teams channels or teams that rely on OpenClaw's allowlist for sender authorization. Essentially, it undermines the security controls intended to limit who can interact with certain Teams routes.