Description
OpenClaw before 2026.3.28 contains a missing rate limiting vulnerability in the Nextcloud Talk webhook authentication that allows attackers to brute-force weak shared secrets. Attackers who can reach the webhook endpoint can exploit this to forge inbound webhook events by repeatedly attempting authentication without throttling.
Published: 2026-03-31
Score: 6.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Forged webhook events via brute force
Action: Patch Immediately
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-9528-x887-j2fp OpenClaw's Nextcloud Talk webhook missing rate limiting on shared secret authentication
History

Tue, 31 Mar 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 31 Mar 2026 18:00:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}


Tue, 31 Mar 2026 14:30:00 +0000

Type Values Removed Values Added
Description OpenClaw before 2026.3.28 contains a missing rate limiting vulnerability in the Nextcloud Talk webhook authentication that allows attackers to brute-force weak shared secrets. Attackers who can reach the webhook endpoint can exploit this to forge inbound webhook events by repeatedly attempting authentication without throttling.
Title OpenClaw < 2026.3.28 - Brute Force Attack via Missing Rate Limiting on Webhook Shared Secret Authentication
First Time appeared Openclaw
Openclaw openclaw
Weaknesses CWE-307
CPEs cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*
Vendors & Products Openclaw
Openclaw openclaw
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}


Subscriptions

Openclaw Openclaw
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-03-31T17:43:23.480Z

Reserved: 2026-03-23T11:00:48.409Z

Link: CVE-2026-33580

cve-icon Vulnrichment

Updated: 2026-03-31T17:18:55.285Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-31T15:16:15.170

Modified: 2026-04-01T18:54:45.187

Link: CVE-2026-33580

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-31T20:38:25Z

Weaknesses