CVE-2026-35670Network attack vector

Reply redirection via mutable username resolution

Published Apr 10, 2026 · Updated Apr 10, 2026

Authorization bypass in OpenClaw before 2026.3.22 allows remote authenticated users to redirect Synology Chat webhook replies. The Synology Chat webhook handler resolves a reply recipient through a mutable username or nickname match instead of retaining the stable numeric user_id recorded by the webhook event. Changing a matching username allows a low-privileged user to redirect a webhook-triggered reply to an unintended account, exposing reply contents and altering delivery.

CVSS severity6.0
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Authorization bypass in OpenClaw before 2026.3.22 allows remote authenticated users to redirect Synology Chat webhook replies. The Synology Chat webhook handler resolves a reply recipient through a mutable username or nickname match instead of retaining the stable numeric user_id recorded by the webhook event. Changing a matching username allows a low-privileged user to redirect a webhook-triggered reply to an unintended account, exposing reply contents and altering delivery.

The record

CVE
CVE-2026-35670
Published
Apr 10, 2026
Updated
Apr 10, 2026
Vendor
OpenClaw Foundation
Product
OpenClaw
Classifications
CWE-807
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <2026.3.22

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenClaw Foundation · OpenClawversion=0 <2026.3.22

Published CVSS scores

5.9VulnCheckCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
6.0VulnCheckCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-807Reliance on Untrusted Inputs in a Security Decision

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo