CVE-2026-21858 on Myles Nieman — Bloghttps://blog.msnieman.com/tags/cve-2026-21858/Recent content in CVE-2026-21858 on Myles Nieman — BlogHugoen-usTue, 17 Feb 2026 00:00:00 +0000BloodFlowhttps://blog.msnieman.com/writeups/bloodflow/Tue, 17 Feb 2026 00:00:00 +0000https://blog.msnieman.com/writeups/bloodflow/A publicly exposed n8n workflow automation instance is vulnerable to CVE-2026-21858, an unauthenticated arbitrary file read to RCE chain, yielding a shell on the target.