Openclaw cli: OpenClaw: Zalo webhook rate limiting could be bypassed before secret validation (CVE-2026-34505)
Description
The OpenClaw CLI Zalo webhook handler had a vulnerability where rate limiting was applied only after webhook authentication succeeded. This allowed attackers to bypass rate limiting by sending requests with invalid secrets, facilitating brute-force guessing of webhook secrets. The issue was fixed in version 2026.3.12 by applying rate limiting before authentication. Users should update to this version or later and use strong webhook secrets.
CVSS v4.0
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-34505 describes a vulnerability in the OpenClaw CLI's Zalo webhook handler where request rate limiting was enforced only after successful authentication. Requests with invalid secrets returned HTTP 401 but did not count against the rate limiter, enabling attackers to repeatedly guess webhook secrets without triggering rate limiting responses (HTTP 429). This flaw made brute-force attacks materially easier against weak but policy-compliant webhook secrets. The vulnerability affects versions >=2026.1.29 and <2026.3.12. The issue was resolved in version 2026.3.12 by applying rate limiting prior to authentication, preventing pre-auth brute-force attempts.
Potential Impact
Attackers could perform brute-force guessing of webhook secrets without triggering rate limiting, increasing the likelihood of secret compromise. Once a secret was guessed, attackers could submit forged Zalo webhook traffic, potentially leading to unauthorized actions or data manipulation via the webhook interface.
Mitigation Recommendations
A patch is available in OpenClaw CLI version 2026.3.12 that applies rate limiting before authentication, closing the pre-auth brute-force gap. Users should update to version 2026.3.12 or later. Additionally, using strong webhook secrets is recommended to reduce the risk of brute-force compromise.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BREW-openclaw-cli-CVE-2026-34505
- Osv Schema Version
- 1.7.3
- Ecosystems
- ["Homebrew"]
- Cvss Version
- 4.0
Threat ID: 6ac245b112601ec6a3166b21
Added to database: 10/04/2026, 12:25:21 UTC
Last enriched: 10/04/2026, 12:57:18 UTC
Last updated: 10/04/2026, 16:08:37 UTC
Views: 1
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