CVE-2026-28481: Openclaw OpenClaw MS Teams Inbound Attachment Vulnerability

MODERATE
Advisory Identifier: GHSA-7vwx-582j-j332
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CVSS 7.4
CWE-201
Published
Advisory Summary

CVE-2026-28481 is a MODERATE (CVSS 7.4) openclaw ms teams inbound attachment vulnerability (CWE-201: Insertion of Sensitive Information Into Sent Data) affecting Openclaw libraries in the npm ecosystem. The issue involves openclaw ms teams inbound attachment downloader leaks bearer tokens to allowlisted suffix domains. Remediation is available by upgrading affected packages to version 2026.2.1.

CVE-2026-28481 at a Glance

CVE Identifier CVE-2026-28481
GHSA Identifier GHSA-7vwx-582j-j332
Severity MODERATE
CVSS v3.1 Base Score 7.4
CWE Classification CWE-201: Insertion of Sensitive Information Into Sent Data
Affected Product Openclaw
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-28481

To remediate this vulnerability, upgrade all affected Openclaw dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

openclaw fixed: 2026.2.1 
npm install openclaw@2026.2.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls openclaw

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-28481, inspect your project dependencies using npm:

npm ls openclaw

Analyze the terminal output to locate any version of Openclaw in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2026.2.1), your application is affected.

Note: The npm ls openclaw command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-201: Insertion of Sensitive Information Into Sent Data, where the code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor. In Openclaw, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## 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 <token>` 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: `<= 2026.1.30` - Patched: `>= 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.

CVE-2026-28481 Affected Openclaw Versions

1 component(s)
Fixed Versions:
2026.2.1
Product / Package Ecosystem Affected Versions Fixed Version
openclaw
npm/openclaw
npm
< 2026.2.1
2026.2.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/openclaw/openclaw/security/advisories/GHSA-7vwx-582j-j332
NVD — CVE-2026-28481 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28481
Security Fix Commit FIX COMMIT
https://github.com/openclaw/openclaw/commit/41cc5bcd4f1d434ad1bbdfa55b56f25025ecbf6b
Openclaw Source Repository REPOSITORY
https://github.com/openclaw/openclaw
Openclaw Release RELEASE
https://github.com/openclaw/openclaw/releases/tag/v2026.2.1
www.vulncheck.com/advisories/openclaw... WEB
https://www.vulncheck.com/advisories/openclaw-bearer-token-leakage-via-ms-teams-attachment-downloader-suffix-matching

Frequently Asked Questions

What is CVE-2026-28481?
CVE-2026-28481 is a security vulnerability in Openclaw involving OpenClaw MS Teams inbound attachment downloader leaks bearer tokens to allowlisted suffix domains under CWE-201: Insertion of Sensitive Information Into Sent Data.
Which Openclaw versions are affected?
Affected versions include releases prior to 2026.2.1 across affected packages: openclaw.
What version fixes CVE-2026-28481?
Upgrading to 2026.2.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is openclaw affected?
Yes, openclaw is affected in releases prior to 2026.2.1. Upgrade your dependency to 2026.2.1 or later.
What is the CVSS score of CVE-2026-28481?
CVE-2026-28481 has a CVSS v3.1 base score of 7.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N.
What CWE is associated with CVE-2026-28481?
CVE-2026-28481 is classified under CWE-201: Insertion of Sensitive Information Into Sent Data (The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor.).
How can I check npm dependencies for CVE-2026-28481?
Run the dependency tree command: 'npm ls openclaw'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-7vwx-582j-j332",
  "modified" : "2026-03-06T01:02:00Z",
  "published" : "2026-02-17T21:38:14Z",
  "aliases" : [ "CVE-2026-28481" ],
  "summary" : "OpenClaw MS Teams inbound attachment downloader leaks bearer tokens to allowlisted suffix domains",
  "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "openclaw"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2026.2.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "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" : "WEB",
    "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"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/openclaw-bearer-token-leakage-via-ms-teams-attachment-downloader-suffix-matching"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-201" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-17T21:38:14Z",
    "nvd_published_at" : "2026-03-05T22:16:22Z"
  }
}