CVE-2026-25750: LangSmith Studio URL parameter injection leaking bearer tokens via crafted link

Summary

A URL parameter injection flaw in LangSmith Studio, part of the langchain-ai/helm charts prior to version 0.12.71, could send an authenticated user's bearer token, user ID and workspace ID to an attacker-controlled server. The flaw affects both LangSmith Cloud and self-hosted deployments. Exploitation requires a victim to click a crafted link, and the stolen tokens expire after 5 minutes, though repeated attacks against the same user remain possible.

Mitigation

Fixed in 0.12.71, which requires user-defined allowed origins for the baseUrl parameter so tokens cannot be sent to unauthorized servers. No known workarounds are available; self-hosted customers must upgrade to the patched version.

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