GHSA-9jpj-g8vv-j5mf CVE-2026-34511

OpenClaw: Gemini OAuth exposed the PKCE verifier through the OAuth state parameter

Medium npm

Severity: 0.0 / 10; Medium · CVSS 4.0
Exploit chance (EPSS): 0.25%; Chance of exploitation in the next 30 days. Higher than 16.12% of scored vulnerabilities.
Known exploited: No; Not in CISA's catalog
Weakness: CWE-345 Insufficient Verification of Data Authenticity
Fix: 2026.4.2; Upgrade openclaw to this version or later

Description

Summary

Before OpenClaw 2026.4.2, the Gemini OAuth flow reused the PKCE verifier as the OAuth state value. Because the provider reflected state back in the redirect URL, the verifier could be exposed alongside the authorization code.

Impact

Anyone who could capture the redirect URL could learn both the authorization code and the PKCE verifier, defeating PKCE's interception protection for that flow and enabling token redemption.

Affected Packages / Versions

Package: openclaw (npm)
Affected versions: <= 2026.4.1
Patched versions: >= 2026.4.2
Latest published npm version: 2026.4.1

Fix Commit(s)

a26f4d0f3ef0757db6c6c40277cc06a5de76c52f — separate OAuth state from the PKCE verifier

OpenClaw thanks @BG0ECV for reporting.

Affected versions

npm

Package	Vulnerable	Fixed in
openclaw	`< 2026.4.2`	`2026.4.2`

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

openclaw npm → `2026.4.2`

npm

npm install openclaw@2026.4.2

yarn

yarn add openclaw@2026.4.2

pnpm

pnpm add openclaw@2026.4.2

Severity breakdown

CVSS 4.0 0.0

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:H/SI:H/SA:N

Attack vector: Network
Attack complexity: High
Attack requirements: Present
Privileges required: None
User interaction: Active
Confidentiality (vulnerable system): High
Integrity (vulnerable system): None
Availability (vulnerable system): None
Confidentiality (subsequent systems): High
Integrity (subsequent systems): High
Availability (subsequent systems): None

CVSS 3.1 5.9

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack vector: Network
Attack complexity: High
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Weakness

CWE-345: Insufficient Verification of Data Authenticity

The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

References

Advisories

nvd.nist.gov/vuln/detail/CVE-2026-34511

Packages

github.com/openclaw/openclaw

Timeline

Apr 3, 2026 Published
Jul 24, 2026 Last updated by the source
Oct 31, 2026 Latest EPSS score

Advisory	Severity	Why it's related
GHSA-3x84-qq85-fj65 OpenClaw: Browser CDP discovery could accept blocked WebSocket URLs	High	Also affects openclaw
GHSA-9c3v-684m-579c OpenClaw MCP SSE redirects could forward Authorization headers	Medium	Also affects openclaw
GHSA-f397-5vjw-v2c2 OpenClaw: Shell inline-command parsing could miss an allowlist check	High	Also affects openclaw
GHSA-rx78-29qr-5hq8 OpenClaw: Workspace-derived service PATH could influence trash command selection	High	Also affects openclaw
GHSA-ccwh-wwpp-6wg5 OpenClaw: Host environment sanitizer missed two Node.js control variables	High	Also affects openclaw
GHSA-985f-72mj-8gf7 OpenClaw: Tool group policy callers could accept unvalidated group IDs	Medium	Also affects openclaw
GHSA-9v8j-9c9g-w66c OpenClaw: Bootstrap token replay could widen pending pairing scopes	Medium	Also affects openclaw
GHSA-c226-q6fx-6j6c OpenClaw: macOS Swift exec allowlist missed combined POSIX inline flags	Medium	Also affects openclaw

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