Vulnerability · Published Apr 11, 2026 · Assigned by zdi

CVE-2026-3691OpenClaw Client PKCE Verifier Information Disclosure Vulnerability

Medium 5.3

In plain English

A medium-severity information exposure in OpenClaw from OpenClaw. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.0)5.3Medium

Exploit odds (30 days)0.5%top 60.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	openclaw	2026.2.25	GHSA-6g25-pc82-vfwp

Affected products (as reported)

Vendor	Product	Versions
OpenClaw	OpenClaw	2026.2.21

Weakness: CWE-200 · Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

References

ZDI-26-229 x_research-advisory
vendor-provided URL vendor-advisory