GitHub Advisoryadvisory · npm
GHSA-7vwx-582j-j332 OpenClaw MS Teams inbound attachment downloader leaks bearer tokens to allowlisted suffix domains
MEDIUM
Official page ↗
- Aliases
- CVE-2026-28481
- Ecosystem
- npm
- Packages
- openclaw
- Severity
- Moderate
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
- Weaknesses
- CWE-201
- Reviewed
- 2026-02-17
Affected packages
• npm openclaw: < 2026.2.1 → fixed in 2026.2.1
Description
Summary
NOTE: This only affects deployments that enable the optional MS Teams extension (Teams channel). If you do not use MS Teams, you are not impacted.
When OpenClaw downloads inbound MS Teams attachments / inline images, it may retry a URL with an `Authorization: Bearer ` header after receiving `401` or `403`.
Because the default download allowlist uses suffix matching (and includes some multi-tenant suffix domains), a message that references an untrusted but allowlisted host could cause that bearer token to be sent to the wrong place.
Affected Packages / Versions
• Package: `openclaw` (npm)
• Vulnerable: `= 2026.2.1`
Fix
• Fix commit: `41cc5bcd4f1d434ad1bbdfa55b56f25025ecbf6b`
• Upgrade to `openclaw >= 2026.2.1`
Workarounds
• If you do not need MS Teams, disable the MS Teams extension.
• If you must stay on an older version, ensure the auth host allowlist is strict (only Microsoft-owned endpoints that require auth) and avoid wildcard or broad suffix entries.
Credits
Thanks @yueyueL for reporting.
Related
Alias · CVE (1)
- CVE-2026-28481 OpenClaw versions 2026.1.30 and earlier, contain an information disclosure vulnerability, patched in 2026.2.1, in the MS Teams attachment… vulnerability
Weakness · CWE (1)
- CWE-201 Insertion of Sensitive Information Into Sent Data weakness
References
- https://github.com/openclaw/openclaw/security/advisories/GHSA-7vwx-582j-j332 web
- https://nvd.nist.gov/vuln/detail/CVE-2026-28481 advisory
- https://github.com/openclaw/openclaw/commit/41cc5bcd4f1d434ad1bbdfa55b56f25025ecbf6b web
- https://github.com/openclaw/openclaw package
- https://github.com/openclaw/openclaw/releases/tag/v2026.2.1 web
- https://www.vulncheck.com/advisories/openclaw-bearer-token-leakage-via-ms-teams-attachment-downloader-suffix-matching web