OpenClaw Canvas Authentication Bypass Vulnerability

March 30th, 2026
ZDI-26-228 ZDI-CAN-29311

CVE ID

CVE-2026-3690

CVSS Score

7.4 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected Vendors

OpenClaw

Affected Products

OpenClaw

Vulnerability Details

This vulnerability allows remote attackers to bypass authentication on affected installations of OpenClaw. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the implementation of the the authentication function for canvas endpoints. The issue results from improper implementation of authentication. An attacker can leverage this vulnerability to bypass authentication on the system.

Additional Details

OpenClaw has issued an update to correct this vulnerability. More details can be found at:
https://github.com/openclaw/openclaw/security/advisories/GHSA-vvjh-f6p9-5vcf

Disclosure Timeline

  • 2026-02-20 - Vulnerability reported to vendor
  • 2026-03-30 - Coordinated public release of advisory
  • 2026-03-30 - Advisory Updated

Credit

Peter Girnus (@gothburz) and Project AESIR of TrendAI Zero Day Initiative

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