EUVD-2026-21623

| CVE-2026-3691 MEDIUM
2026-04-11 zdi
5.3
CVSS 3.0
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CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

3
EUVD ID Assigned
Apr 11, 2026 - 01:00 euvd
EUVD-2026-21623
Analysis Generated
Apr 11, 2026 - 01:00 vuln.today
CVE Published
Apr 11, 2026 - 00:17 nvd
MEDIUM 5.3

Tags

Information Disclosure

Description

OpenClaw Client PKCE Verifier Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose stored credentials on affected installations of OpenClaw. User interaction is required to exploit this vulnerability in that the target must initiate an OAuth authorization flow. The specific flaw exists within the implementation of OAuth authorization. The issue results from the exposure of sensitive data in the authorization URL query string. An attacker can leverage this vulnerability to disclose stored credentials, leading to further compromise. Was ZDI-CAN-29381.

Analysis

OpenClaw Client exposes PKCE verifier and stored credentials through unencrypted OAuth authorization URL query strings, allowing remote attackers to disclose authentication data when users initiate OAuth flows. The vulnerability requires user interaction (target must start authorization), has a CVSS score of 5.3 (medium), and affects all versions of OpenClaw Client. …

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Priority Score

27
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +26
POC: 0

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EUVD-2026-21623 vulnerability details – vuln.today
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