CVE-2026-42073 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-42073MEDIUM

Gitlawb openclaude — OpenClaude's MCP OAuth Callback: State Check Bypass via error Param Leads to DoS

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  N  N  H    6.5   .0022   12.6     —

AFFECTED
  Product     Versions   Fixed
  openclaude  < 0.5.1 –  —

TIMELINE
  Apr 23  Reserved by GitHub_M
  Jun 2   EXPLOIT PUBLISHED — CVE-2026-42073 (Gitlawb openclaude). Public exploit reference added.
  Jun 2   Published (CNA: GitHub_M)

CWE-352, CWE-400 · CNA: GitHub_M · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 23, 2026	Reserved	Reserved by GitHub_M
June 2, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-42073 (Gitlawb openclaude). Public exploit reference added.
June 2, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Gitlawb	openclaude	—	< 0.5.1	—

Weaknesses

CWE-352 · CWE-400

References (3)

https://github.com/Gitlawb/openclaude/commit/739b8d1f40fde0e401a5cbd2b9a55d88bd5124ad [Patch]
https://github.com/Gitlawb/openclaude/releases/tag/v0.5.1 [Release Notes]
https://github.com/Gitlawb/openclaude/security/advisories/GHSA-c73c-x77g-854r [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-42073 at cve.org

Vendors: gitlawb

Weaknesses: CWE-352 · CWE-400

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-42073 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.