CVE-2026-35652: OpenClaw Mattermost Callback Dispatch Allowed Non-allowlisted Vulnerability

MODERATE
Advisory Identifier: GHSA-8883-9w57-vwv6
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CVSS 6.5
CWE-285 CWE-863 CWE-696
Published
Advisory Summary

CVE-2026-35652 is a MODERATE (CVSS 6.5) mattermost callback dispatch allowed non-allowlisted vulnerability (CWE-285: Improper Authorization) affecting OpenClaw libraries in the npm ecosystem. The issue involves mattermost callback dispatch allowed non-allowlisted sender actions. Remediation is available by upgrading affected packages to version 2026.3.22.

CVE-2026-35652 at a Glance

CVE Identifier CVE-2026-35652
GHSA Identifier GHSA-8883-9w57-vwv6
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-285: Improper Authorization
Affected Product OpenClaw
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.5

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:N/S:U/C:N/I:L/A:L).

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

How to Fix CVE-2026-35652

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: 2026.3.22 
npm install openclaw@2026.3.22
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-2026-35652, 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 2026.3.22), 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-285: Improper Authorization, where the product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. 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 Mattermost interactive callback dispatch could run action handlers before normal sender authorization checks completed. ## Affected Packages / Versions - Package: `openclaw` (npm) - Affected: < 2026.3.22 - Fixed: >= 2026.3.22 - Latest released tag checked: `v2026.3.23-2` (`630f1479c44f78484dfa21bb407cbe6f171dac87`) - Latest published npm version checked: `2026.3.23-2` ## Fix Commit(s) - `a47722de7e3c9cbda8d5512747ca7e3bb8f6ee66` ## Release Status The fix shipped in `v2026.3.22` and remains present in `v2026.3.23` and `v2026.3.23-2`. ## Code-Level Confirmation - extensions/mattermost/src/mattermost/interactions.ts now requires callback authorization before dispatching actions. - extensions/mattermost/src/mattermost/monitor.ts routes callback authorization through the same sender and allowlist policy used for normal ingress. OpenClaw thanks @zpbrent for reporting.

CVE-2026-35652 Affected OpenClaw Versions

1 component(s)
Fixed Versions:
2026.3.22
Product / Package Ecosystem Affected Versions Fixed Version
openclaw
npm/openclaw
npm
< 2026.3.22
2026.3.22

References

GitHub Advisory / Wiki ADVISORY
https://github.com/openclaw/openclaw/security/advisories/GHSA-8883-9w57-vwv6
NVD — CVE-2026-35652 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-35652
Security Fix Commit FIX COMMIT
https://github.com/openclaw/openclaw/commit/630f1479c44f78484dfa21bb407cbe6f171dac87
Security Fix Commit FIX COMMIT
https://github.com/openclaw/openclaw/commit/a47722de7e3c9cbda8d5512747ca7e3bb8f6ee66
OpenClaw Source Repository REPOSITORY
https://github.com/openclaw/openclaw
www.vulncheck.com/advisories/openclaw... WEB
https://www.vulncheck.com/advisories/openclaw-unauthorized-action-execution-via-callback-dispatch

Frequently Asked Questions

What is CVE-2026-35652?
CVE-2026-35652 is a security vulnerability in OpenClaw involving Mattermost callback dispatch allowed non-allowlisted sender actions under CWE-285: Improper Authorization.
Which OpenClaw versions are affected?
Affected versions include releases prior to 2026.3.22 across affected packages: openclaw.
What version fixes CVE-2026-35652?
Upgrading to 2026.3.22 (or the latest patched release for your respective branch) resolves the vulnerability.
Is openclaw affected?
Yes, openclaw is affected in releases prior to 2026.3.22. Upgrade your dependency to 2026.3.22 or later.
What is the CVSS score of CVE-2026-35652?
CVE-2026-35652 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
What CWE is associated with CVE-2026-35652?
CVE-2026-35652 is classified under CWE-285: Improper Authorization (The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.).
How can I check npm dependencies for CVE-2026-35652?
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-8883-9w57-vwv6",
  "modified" : "2026-04-10T19:41:54Z",
  "published" : "2026-03-26T21:23:04Z",
  "aliases" : [ "CVE-2026-35652" ],
  "summary" : "OpenClaw: Mattermost callback dispatch allowed non-allowlisted sender actions",
  "details" : "## Summary\nMattermost interactive callback dispatch could run action handlers before normal sender authorization checks completed.\n\n## Affected Packages / Versions\n- Package: `openclaw` (npm)\n- Affected: < 2026.3.22\n- Fixed: >= 2026.3.22\n- Latest released tag checked: `v2026.3.23-2` (`630f1479c44f78484dfa21bb407cbe6f171dac87`)\n- Latest published npm version checked: `2026.3.23-2`\n\n## Fix Commit(s)\n- `a47722de7e3c9cbda8d5512747ca7e3bb8f6ee66`\n\n## Release Status\nThe fix shipped in `v2026.3.22` and remains present in `v2026.3.23` and `v2026.3.23-2`.\n\n## Code-Level Confirmation\n- extensions/mattermost/src/mattermost/interactions.ts now requires callback authorization before dispatching actions.\n- extensions/mattermost/src/mattermost/monitor.ts routes callback authorization through the same sender and allowlist policy used for normal ingress.\n\nOpenClaw thanks @zpbrent for reporting.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "openclaw"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2026.3.22"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/openclaw/openclaw/security/advisories/GHSA-8883-9w57-vwv6"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-35652"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openclaw/openclaw/commit/630f1479c44f78484dfa21bb407cbe6f171dac87"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openclaw/openclaw/commit/a47722de7e3c9cbda8d5512747ca7e3bb8f6ee66"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openclaw/openclaw"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/openclaw-unauthorized-action-execution-via-callback-dispatch"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-285", "CWE-696", "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-26T21:23:04Z",
    "nvd_published_at" : "2026-04-10T17:17:05Z"
  }
}