---
id: CVE-2026-33580
title: >-
  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
summary: >-
  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…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-307
vendor: openclaw
product: openclaw
affected:
  - openclaw < 2026.3.28
patched:
  - openclaw 2026.3.28
published: '2026-03-31'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-33580'
references:
  - url: >-
      https://github.com/openclaw/openclaw/commit/e403decb6e20091b5402780a7ccd2085f98aa3cd
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/openclaw/openclaw/security/advisories/GHSA-9528-x887-j2fp
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/openclaw-brute-force-attack-via-missing-rate-limiting-on-webhook-shared-secret-authentication
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00427
epssPercentile: 0.34263
ingestedAt: '2026-07-24T21:39:13.193Z'
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-03-31T17:18:43.381196Z'
---

## Overview

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.

## Affected

- `openclaw < 2026.3.28`

## Remediation

Upgrade past the affected range:

- `openclaw 2026.3.28`