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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 in the /api/v1/responses endpoint, which accepts a flow identifier and resolves flows through get_flow_by_id_or_endpoint_name. When resolving by UUID, the vulnerable logic queried the target flow without enforcing that the authenticated requester owned or was authorized to invoke that flow, while the endpoint-name branch performed an ownership check. This discrepancy allowed any authenticated user to execute another user’s flow by supplying the victim’s flow ID in the request. In multi-user or multi-tenant deployments, the issue enables cross-user or cross-tenant workflow execution through legitimate application logic. Because Langflow flows may embed provider credentials, cloud credentials, and database connection material, exploitation can expose sensitive secrets and permit misuse of the victim’s configured integrations. The vulnerability was fixed by adding an ownership check 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.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
97 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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.