Information disclosure in Openclaw
CVE-2026-3691
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.
Vulnerability class: Information Disclosure
EPSS: 0.005 (37.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.
Affected products
- Openclaw — versions 2026.2.21
Weakness classification (CWE)
References
- zdi-disclosures@trendmicro.com (x_research-advisory, Third Party Advisory)
- zdi-disclosures@trendmicro.com (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-3691?
- CVE-2026-3691 is a medium-severity vulnerability in Openclaw, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-04-11.
- How severe is CVE-2026-3691?
- Medium severity. CVSS v3 base score is 5.3 out of 10.