CVE-2026-34508Network attack vector

Forged Zalo webhooks via post-authentication rate limiting

Published Mar 31, 2026 · Updated Mar 31, 2026

Improper rate limiting in OpenClaw before 2026.3.12 allows remote attackers to brute-force Zalo webhook secrets via repeated requests. The Zalo webhook handler returns 401 for invalid secrets before recording the failed attempt, so repeated guesses never reach the 429 limit. Webhook mode and a guessable secret are required; a recovered secret permits forged Zalo webhook traffic, and this CVE is rejected as a duplicate.

CVSS severity6.3
Medium
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper rate limiting in OpenClaw before 2026.3.12 allows remote attackers to brute-force Zalo webhook secrets via repeated requests. The Zalo webhook handler returns 401 for invalid secrets before recording the failed attempt, so repeated guesses never reach the 429 limit. Webhook mode and a guessable secret are required; a recovered secret permits forged Zalo webhook traffic, and this CVE is rejected as a duplicate.

The record

CVE
CVE-2026-34508
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
OpenClaw Foundation
Product
OpenClaw
Classifications
CWE-307, T1110
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2026.3.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenClaw Foundation · OpenClawversion=0 <2026.3.12

Published CVSS scores

6.5GitHub Security Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
6.3GitHub Security Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
T1110Brute Force

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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