CVE-2026-34506: OpenClaw's MS Teams sender allowlist bypass when route allowlist is configured and sender allowlist is empty

OpenClaw's Microsoft Teams plugin widened group sender authorization when a team/channel route allowlist was configured but groupAllowFrom was empty. Before the fix, a matching route allowlist entry could cause the message handler to synthesize wildcard sender authorization for that route, allowing any sender in the matched team/channel to bypass the intended groupPolicy: "allowlist" sender check.

This does not affect default unauthenticated access, but it does weaken a documented Teams group authorization boundary and can allow unauthorized group senders to trigger replies in allowlisted Teams routes.

Affected Packages / Versions

• Package: openclaw (npm)
• Latest published vulnerable version: 2026.3.7
• Affected range: <= 2026.3.7
• Fixed in released version: 2026.3.8

Fix Commit(s)

• 88aee9161e0e6d32e810a25711e32a808a1777b2

Release Verification

• Verified fixed in GitHub release v2026.3.8 published on March 9, 2026.
• Verified npm view openclaw version resolves to 2026.3.8.
• Verified the release contains the regression test covering the Teams route-allowlist sender-bypass case and that the test passes against the v2026.3.8 tree.

Thanks @zpbrent for reporting.