CVE-2026-34506 | THREATINT

Description

OpenClaw before 2026.3.8 contains a sender allowlist bypass vulnerability in its Microsoft Teams plugin that allows unauthorized senders to bypass intended authorization checks. When a team/channel route allowlist is configured with an empty groupAllowFrom parameter, the message handler synthesizes wildcard sender authorization, permitting any sender in the matched team/channel to trigger replies in allowlisted Teams routes.

PUBLISHED Reserved 2026-03-30 | Published 2026-03-31 | Updated 2026-03-31 | Assigner VulnCheck

LOW: 2.3CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Problem types

CWE-863: Incorrect Authorization

Product status

Default status

unaffected

Any version before 2026.3.8

affected

2026.3.8 (semver)

unaffected

Credits

Peng Zhou (@zpbrent) reporter

References

github.com/...enclaw/security/advisories/GHSA-g7cr-9h7q-4qxq (GitHub Security Advisory (GHSA-g7cr-9h7q-4qxq)) third-party-advisory

github.com/...ommit/88aee9161e0e6d32e810a25711e32a808a1777b2 (Patch Commit) patch

www.vulncheck.com/...lugin-via-route-allowlist-configuration (VulnCheck Advisory: OpenClaw < 2026.3.8 - Sender Allowlist Bypass in Microsoft Teams Plugin via Route Allowlist Configuration) third-party-advisory

cve.org (CVE-2026-34506)

nvd.nist.gov (CVE-2026-34506)

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