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CVE-2026-27493 is a second-order expression injection vulnerability in n8n, an open-source workflow automation platform. Affected versions prior to 2.10.1, 2.9.3, and 1.123.22 improperly handle attacker-controlled input submitted through public Form nodes. In a vulnerable workflow configuration, if a Form node later interpolates a value originally supplied by an unauthenticated user and that value begins with an '=' character, n8n interprets the content as an expression and evaluates it a second time. This double-evaluation behavior allows an unauthenticated attacker to inject and execute arbitrary n8n expressions within the expression context. The flaw is second-order because the malicious payload is submitted and stored first, then evaluated later during workflow processing. By itself, the issue is generally limited to expression-context access, but when chained with a separate expression sandbox escape vulnerability it can be escalated to remote code execution on the host running n8n.
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A critical unauthenticated expression injection vulnerability in n8n Form nodes that can lead to arbitrary shell command execution (remote code execution) via double-evaluated expressions in form fields.
An unauthenticated expression evaluation flaw in n8n Form nodes that can be abused for expression injection and, when chained with a sandbox escape such as CVE-2026-27577, can lead to remote code execution on the n8n host.
A second-order expression injection (code injection) flaw in n8n Form nodes where user-supplied form fields beginning with '=' are treated as expressions and evaluated (double-evaluation), enabling unauthenticated expression execution and potential RCE when chained with an expression sandbox escape.
A second-order expression injection (code injection) flaw in n8n Form nodes where user-supplied form values beginning with '=' are treated as expressions and evaluated (double-evaluation), enabling unauthenticated expression injection and potential RCE when chained with an expression sandbox escape.
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