CVE-2026-41354Network attack vector

Message suppression via under-scoped replay deduplication

Published Apr 23, 2026 · Updated Apr 23, 2026

Availability flaw in OpenClaw before 2026.4.2 allows remote attackers to suppress Zalo webhook messages across chat sessions. The Zalo webhook replay check keys its recent-event cache by target, account, event name, and message ID but omits chat and sender identifiers. Reachability requires the Zalo integration and reused message IDs across chats or senders; collisions silently discard legitimate events and interrupt bot workflows.

CVSS severity6.3
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Availability flaw in OpenClaw before 2026.4.2 allows remote attackers to suppress Zalo webhook messages across chat sessions. The Zalo webhook replay check keys its recent-event cache by target, account, event name, and message ID but omits chat and sender identifiers. Reachability requires the Zalo integration and reused message IDs across chats or senders; collisions silently discard legitimate events and interrupt bot workflows.

The record

CVE
CVE-2026-41354
Published
Apr 23, 2026
Updated
Apr 23, 2026
Vendor
OpenClaw Foundation
Product
OpenClaw
Classifications
CWE-349, CWE-440, CWE-706, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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 <2026.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenClaw Foundation · OpenClawversion=0 <2026.4.2

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
6.3VulnCheckCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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-349Acceptance of Extraneous Untrusted Data With Trusted Data
CWE-440Expected Behavior Violation
CWE-706Use of Incorrectly-Resolved Name or Reference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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