CVE-2026-41376Network attack vector

Unauthorized Matrix context injection via unchecked senders

Published Apr 28, 2026 · Updated Apr 28, 2026

Origin validation error in OpenClaw before 2026.3.31 allows remote attackers to inject excluded Matrix context via crafted replies. The Matrix room-message handler fetched thread-root and reply events into prompt context without checking their senders against effective room or group allowlists. Exploitation requires an allowlisted message to reference content from a blocked sender; the blocked content can then influence agent processing or be disclosed in context.

CVSS severity2.3
Low
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation error in OpenClaw before 2026.3.31 allows remote attackers to inject excluded Matrix context via crafted replies. The Matrix room-message handler fetched thread-root and reply events into prompt context without checking their senders against effective room or group allowlists. Exploitation requires an allowlisted message to reference content from a blocked sender; the blocked content can then influence agent processing or be disclosed in context.

The record

CVE
CVE-2026-41376
Published
Apr 28, 2026
Updated
Apr 28, 2026
Vendor
OpenClaw Foundation
Product
OpenClaw
Classifications
CWE-346, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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 <2026.3.31

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenClaw Foundation · OpenClawversion=0 <2026.3.31

Published CVSS scores

2.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
5.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A: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-346Origin Validation Error
T1190Exploit Public-Facing Application

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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