CVE-2026-42073: medium-severity vulnerability in Gitlawb openclaude
OpenClaude's MCP OAuth Callback: State Check Bypass via error Param Leads to DoS
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 0.3%
OpenClaude is an open-source coding-agent command line interface for cloud and local model providers. Prior to version 0.5.1, the OpenClaude MCP authentication flow starts a temporary local HTTP server to handle OAuth callbacks. To prevent CSRF attacks, the server validates a state parameter against an internally stored value. However, due to a logic flaw in the order of conditionals, an attacker can completely bypass this check and force the server to shut down — without knowing the state value at all. This issue has been patched in version 0.5.1.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Affected products
Gitlawb · openclaudeRelated CVEs — Gitlawb openclaude
In the same product, most dangerous first.
CVE-2026-42074CRITICALOpenClaude: Sandbox Bypass via Model-Controlled `dangerouslyDisableSandbox` InputEPSS 0.6%CVE-2026-90712MEDIUMGitlawb openclaude xAI OAuth Callback xaiOAuthCallback.ts waitForCallback denial of serviceEPSS 0.6%CVE-2026-35570HIGHOpenClaude has Sandbox Bypass via Early-Exit Logic Flaw that Allows Path TraversalEPSS 0.2%