Cybersecurity researchers have disclosed details of two now-patched security flaws in the n8n workflow automation platform, including two critical bugs that could result in arbitrary command execution.
The vulnerabilities are listed below - CVE-2026-27577 (CVSS score: 9.4) - Expression sandbox escape leading to remote code execution (RCE) CVE-2026-27493 (CVSS score: 9.5) - Unauthenticated
"CVE-2026-27577 is a sandbox escape in the expression compiler: a missing case in the AST rewriter lets process slip through untransformed, giving any authenticated expression full RCE," Pillar Security researcher Eilon Cohen, who discovered and reported the issues, said in a report shared with The Hacker News.
The cybersecurity company described CVE-2026-27493 as a "double-evaluation bug" in n8n's Form nodes that could be abused for expression injection by taking advantage of the fact that the form endpoints are public by design and require neither authentication nor an n8n account.
All it takes for successful exploitation is to leverage a public "Contact Us" form to execute arbitrary shell commands by simply providing a payload as input into the Name field.