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CVE-2026-55235 is an authorization bypass issue in langgraph-api, the LangGraph Server runtime, caused by insufficient restriction of webhook target URLs. In affected deployments, an attacker who can create a run or cron can supply a relative webhook target that is delivered to in-process application routes. Because these internal deliveries can reach same-process endpoints without the expected external authentication checks, the flaw allows requests to cross per-user authorization boundaries. Successful exploitation can trigger unauthorized actions against another user's thread or run context and may expose limited metadata from the targeted thread in the resulting run record.
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Cross-references every affected SKU, including bundled OEM variants.
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