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CVE-2026-3691

OpenClaw Client PKCE Verifier Information Disclosure Vulnerability

5.3 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.48%Up 0.4 points since Apr 11, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.3

OpenClaw Client PKCE Verifier Information Disclosure Vulnerability

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.

Record
CVE-2026-3691
CVSS 3.0
5.3 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
EUVDEUVD-2026-21623 5.3

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.

Record
EUVD-2026-21623
CVSS 3.0
5.3 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-4h5x-fjp7-jhq3 5.3

OpenClaw Client PKCE Verifier Information Disclosure Vulnerability. This vulnerability allows...

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.

Record
GHSA-4h5x-fjp7-jhq3
CVSS 3.0
5.3 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
GitHub AdvisoriesGHSA-6g25-pc82-vfwp 5.1

OpenClaw: macOS beta onboarding exposed PKCE verifier via OAuth state

Summary

The affected surface is the OpenClaw macOS app onboarding flow, and the macOS app is currently in beta. In that beta onboarding flow, Anthropic OAuth used the PKCE code_verifier value as OAuth state, exposing that secret in front-channel URL state.

Affected Packages / Versions

  • Package: openclaw (npm)
  • Affected versions: <= 2026.2.24 (latest published npm at triage time)
  • Affected surface: macOS app beta onboarding path (apps/macos)
  • Not affected: core CLI/gateway onboarding paths
  • Patched version : 2026.2.25

Impact

Scope is limited to the macOS beta onboarding OAuth path. Exploitation required obtaining both OAuth authorization artifacts and exposed state values during that flow.

Remediation

OpenClaw removed Anthropic OAuth sign-in from macOS onboarding and now supports setup-token-only Anthropic subscription auth in this path.

Fix Commit(s)

  • 8f3310000a8b0c11eced054c2cdb6fb27803511a

Release Process Note

patched_versions is pre-set to the release (2026.2.25). Advisory published with npm release 2026.2.25.2.25` is published, this advisory is published.

OpenClaw thanks @zdi-disclosures for reporting.

Record
GHSA-6g25-pc82-vfwp
CVSS 4.0
5.1 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-200
Updated
2026-11-02
NVD 5.3

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.

Record
CVE-2026-3691
CVSS 3.0
5.3 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
OSV 5.3

OpenClaw Client PKCE Verifier Information Disclosure Vulnerability

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.

Record
CVE-2026-3691
CVSS 3.0
5.3 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
OSVGHSA-6g25-pc82-vfwp 5.1

OpenClaw: macOS beta onboarding exposed PKCE verifier via OAuth state

Summary

The affected surface is the OpenClaw macOS app onboarding flow, and the macOS app is currently in beta. In that beta onboarding flow, Anthropic OAuth used the PKCE code_verifier value as OAuth state, exposing that secret in front-channel URL state.

Affected Packages / Versions

  • Package: openclaw (npm)
  • Affected versions: <= 2026.2.24 (latest published npm at triage time)
  • Affected surface: macOS app beta onboarding path (apps/macos)
  • Not affected: core CLI/gateway onboarding paths
  • Patched version : 2026.2.25

Impact

Scope is limited to the macOS beta onboarding OAuth path. Exploitation required obtaining both OAuth authorization artifacts and exposed state values during that flow.

Remediation

OpenClaw removed Anthropic OAuth sign-in from macOS onboarding and now supports setup-token-only Anthropic subscription auth in this path.

Fix Commit(s)

  • 8f3310000a8b0c11eced054c2cdb6fb27803511a

Release Process Note

patched_versions is pre-set to the release (2026.2.25). Advisory published with npm release 2026.2.25.2.25` is published, this advisory is published.

OpenClaw thanks @zdi-disclosures for reporting.

Record
GHSA-6g25-pc82-vfwp
CVSS 4.0
5.1 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-200
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
openclaw
npm
 through 2026.2.24
2026.2.25
openclaw
npm
 before 2026.2.25
2026.2.25

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-3691 is a medium vulnerability (CVSS 5.3) in Openclaw, published March 3, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.48%, the 41st percentile. Fixed in openclaw 2026.2.25.

References

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