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CVE-2026-54052 is a critical authorization flaw in n8n-MCP affecting versions prior to 2.56.1. In HTTP deployments where multi-tenancy is enabled with ENABLE_MULTI_TENANT=true, local workflow version history backups were not isolated on a per-tenant basis. As a result, an authenticated tenant could access workflow version snapshots belonging to other tenants and could also delete or destroy other tenants’ stored backups. Exposed backup contents could include workflow snapshots, full node definitions, credential references, and authorization headers. The issue is a cross-tenant access control failure in backup storage and retrieval logic within the workflow version history feature.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.