CVE-2026-33580: Openclaw OpenClaw's Nextcloud Talk Webhook Missing Vulnerability

MODERATE
Advisory Identifier: GHSA-9528-x887-j2fp
Share
CWE-307
Published
Advisory Summary

CVE-2026-33580 is a MODERATE openclaw's nextcloud talk webhook missing vulnerability (CWE-307: Improper Restriction of Excessive Authentication Attempts) affecting Openclaw libraries in the npm ecosystem. The issue involves openclaw's nextcloud talk webhook missing rate limiting on shared secret authentication. Remediation is available by upgrading affected packages to version 2026.3.28.

CVE-2026-33580 at a Glance

CVE Identifier CVE-2026-33580
GHSA Identifier GHSA-9528-x887-j2fp
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-307: Improper Restriction of Excessive Authentication Attempts
Affected Product Openclaw
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-33580

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: 2026.3.28 
npm install openclaw@2026.3.28
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-2026-33580, 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 2026.3.28), 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-307: Improper Restriction of Excessive Authentication Attempts, where the product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame. 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 Nextcloud Talk webhook signature failures were not throttled even though the integration relies on an operator-configured shared secret that may be weak. ## Impact An attacker who could reach the webhook endpoint could brute-force weak secrets online and then forge inbound webhook events. ## Affected Component `extensions/nextcloud-talk/src/monitor.ts` ## Fixed Versions - Affected: `<= 2026.3.24` - Patched: `>= 2026.3.28` - Latest stable `2026.3.28` contains the fix. ## Fix Fixed by commit `e403decb6e` (`nextcloud-talk: throttle repeated webhook auth failures`). OpenClaw thanks @AntAISecurityLab for reporting.

CVE-2026-33580 Affected Openclaw Versions

1 component(s)
Fixed Versions:
2026.3.28
Product / Package Ecosystem Affected Versions Fixed Version
openclaw
npm/openclaw
npm
< 2026.3.28
2026.3.28

References

GitHub Advisory / Wiki ADVISORY
https://github.com/openclaw/openclaw/security/advisories/GHSA-9528-x887-j2fp
NVD — CVE-2026-33580 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33580
Security Fix Commit FIX COMMIT
https://github.com/openclaw/openclaw/commit/e403decb6e20091b5402780a7ccd2085f98aa3cd
Openclaw Source Repository REPOSITORY
https://github.com/openclaw/openclaw
Openclaw Release RELEASE
https://github.com/openclaw/openclaw/releases/tag/v2026.3.28
www.vulncheck.com/advisories/openclaw... WEB
https://www.vulncheck.com/advisories/openclaw-brute-force-attack-via-missing-rate-limiting-on-webhook-shared-secret-authentication

Frequently Asked Questions

What is CVE-2026-33580?
CVE-2026-33580 is a security vulnerability in Openclaw involving OpenClaw's Nextcloud Talk webhook missing rate limiting on shared secret authentication under CWE-307: Improper Restriction of Excessive Authentication Attempts.
Which Openclaw versions are affected?
Affected versions include releases prior to 2026.3.28 across affected packages: openclaw.
What version fixes CVE-2026-33580?
Upgrading to 2026.3.28 (or the latest patched release for your respective branch) resolves the vulnerability.
Is openclaw affected?
Yes, openclaw is affected in releases prior to 2026.3.28. Upgrade your dependency to 2026.3.28 or later.
What CWE is associated with CVE-2026-33580?
CVE-2026-33580 is classified under CWE-307: Improper Restriction of Excessive Authentication Attempts (The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame.).
How can I check npm dependencies for CVE-2026-33580?
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-9528-x887-j2fp",
  "modified" : "2026-04-06T22:53:25Z",
  "published" : "2026-03-31T23:59:17Z",
  "aliases" : [ "CVE-2026-33580" ],
  "summary" : "OpenClaw's Nextcloud Talk webhook missing rate limiting on shared secret authentication",
  "details" : "## Summary\n\nNextcloud Talk webhook signature failures were not throttled even though the integration relies on an operator-configured shared secret that may be weak.\n\n## Impact\n\nAn attacker who could reach the webhook endpoint could brute-force weak secrets online and then forge inbound webhook events.\n\n## Affected Component\n\n`extensions/nextcloud-talk/src/monitor.ts`\n\n## Fixed Versions\n\n- Affected: `<= 2026.3.24`\n- Patched: `>= 2026.3.28`\n- Latest stable `2026.3.28` contains the fix.\n\n## Fix\n\nFixed by commit `e403decb6e` (`nextcloud-talk: throttle repeated webhook auth failures`).\n\nOpenClaw thanks @AntAISecurityLab for reporting.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "openclaw"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2026.3.28"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2026.3.24"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/openclaw/openclaw/security/advisories/GHSA-9528-x887-j2fp"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33580"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openclaw/openclaw/commit/e403decb6e20091b5402780a7ccd2085f98aa3cd"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openclaw/openclaw"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openclaw/openclaw/releases/tag/v2026.3.28"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/openclaw-brute-force-attack-via-missing-rate-limiting-on-webhook-shared-secret-authentication"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-307" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-31T23:59:17Z",
    "nvd_published_at" : null
  }
}