CVE-2026-41398

Unauthorized agent requests via overbroad origin trust

Published Apr 28, 2026 · Updated Apr 28, 2026

Improper access control in OpenClaw before 2026.4.2 allows attackers to dispatch unauthorized agent requests via its iOS A2UI bridge. ScreenWebView accepted A2UI actions from any local-network canvas URL instead of requiring the bundled scaffold or exact capability-backed remote URL. Exploitation requires user interaction to load an attacker-controlled local-network or tailnet page; demonstrated impact is limited to non-owner session-state pollution and budget consumption, not owner-only actions or arbitrary host execution.

CVSS severity2.1
Low
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in OpenClaw before 2026.4.2 allows attackers to dispatch unauthorized agent requests via its iOS A2UI bridge. ScreenWebView accepted A2UI actions from any local-network canvas URL instead of requiring the bundled scaffold or exact capability-backed remote URL. Exploitation requires user interaction to load an attacker-controlled local-network or tailnet page; demonstrated impact is limited to non-owner session-state pollution and budget consumption, not owner-only actions or arbitrary host execution.

The record

CVE
CVE-2026-41398
Published
Apr 28, 2026
Updated
Apr 28, 2026
Vendor
OpenClaw Foundation
Product
OpenClaw
Classifications
CWE-346, T1204.001
Attack vector
adjacent
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 <2026.4.2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

OpenClaw Foundation · OpenClawversion=0 <2026.4.2

Published CVSS scores

2.1VulnCheckCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
4.6VulnCheckCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error
T1204.001Malicious Link

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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