{"id":"CVE-2026-28481","aliases":["GHSA-7vwx-582j-j332"],"url":"https://o3.security/vulnerability/CVE-2026-28481","summary":"OpenClaw < 2026.2.1 - Bearer Token Leakage via MS Teams Attachment Downloader Suffix Matching","details":"## Summary\n\nNOTE: This only affects deployments that enable the optional MS Teams extension (Teams channel). If you do not use MS Teams, you are not impacted.\n\nWhen OpenClaw downloads inbound MS Teams attachments / inline images, it may retry a URL with an `Authorization: Bearer <token>` header after receiving `401` or `403`.\n\nBecause 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.\n\n## Affected Packages / Versions\n\n- Package: `openclaw` (npm)\n- Vulnerable: `<= 2026.1.30`\n- Patched: `>= 2026.2.1`\n\n## Fix\n\n- Fix commit: `41cc5bcd4f1d434ad1bbdfa55b56f25025ecbf6b`\n- Upgrade to `openclaw >= 2026.2.1`\n\n## Workarounds\n\n- If you do not need MS Teams, disable the MS Teams extension.\n- 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.\n\n## Credits\n\nThanks @yueyueL for reporting.","published":"2026-03-05T21:59:56.444Z","modified":"2026-08-12T03:51:33.693591240Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"openclaw","fixedVersion":"2026.2.1"}],"fix":{"url":"https://github.com/openclaw/openclaw/commit/41cc5bcd4f1d434ad1bbdfa55b56f25025ecbf6b","label":"openclaw/openclaw@41cc5bc"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28481.json"},{"type":"ADVISORY","url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-7vwx-582j-j332"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28481"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/openclaw-bearer-token-leakage-via-ms-teams-attachment-downloader-suffix-matching"},{"type":"FIX","url":"https://github.com/openclaw/openclaw/commit/41cc5bcd4f1d434ad1bbdfa55b56f25025ecbf6b"},{"type":"PACKAGE","url":"https://github.com/openclaw/openclaw"},{"type":"WEB","url":"https://github.com/openclaw/openclaw/releases/tag/v2026.2.1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:33.693591240Z"}}