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CVE-2026-27577 is a critical expression sandbox escape vulnerability in n8n, an open source workflow automation platform. The flaw resides in the workflow expression evaluation mechanism, where crafted expressions in workflow parameters can bypass intended sandbox restrictions and reach unsafe runtime functionality. Public reporting attributes the issue to a missing case in the abstract syntax tree rewriter that allowed the Node.js process object to remain accessible instead of being safely transformed into the restricted expression context. An authenticated user with permission to create or modify workflows can abuse this weakness to trigger unintended system command execution on the host running n8n. The issue was identified as an additional exploit path related to earlier expression-evaluation weaknesses and was fixed in n8n versions 2.10.1, 2.9.3, and 1.123.22.
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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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15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A previously fixed n8n expression-sandbox escape vulnerability referenced as the earlier flaw whose February fix was being probed when the new bypass was discovered.
A critical n8n vulnerability in the workflow expression evaluation system described as an additional exploit discovered following CVE-2025-68613.
An expression sandbox escape vulnerability in n8n that can allow an authenticated user with workflow creation or modification permissions to achieve remote code execution on the host.
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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.