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CVE-2026-55255 is an insecure direct object reference and broken object-level authorization vulnerability in Langflow affecting versions prior to 1.9.1. The flaw is present in the /api/v1/responses endpoint, where an authenticated user can supply another user's flow identifier and cause that flow to be resolved and executed without a proper ownership check. Reported analysis attributes the issue to UUID-based flow resolution logic in get_flow_by_id_or_endpoint_name, where the code path for direct flow ID lookup did not enforce that the requested flow belonged to the authenticated requester. As a result, a low-privileged authenticated attacker can invoke flows owned by other users or tenants, including workflows that may contain embedded secrets, external service integrations, and privileged automation steps. The issue was fixed by adding ownership validation for UUID-based flow resolution in Langflow 1.9.1.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
100 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Langflow vulnerability listed among vulnerabilities actively exploited or operationally weaponized in July 2026.
An additional actively exploited Langflow vulnerability affecting multiple components, referenced as related context.
A Langflow IDOR vulnerability mentioned as having been flagged by CISA as exploited in the wild.
A cross-user authorization bypass vulnerability in Langflow, fixed in version 1.9.1.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.