cyberchef (npm) — known CVEs & security advisories

Known CVE vulnerabilities and GitHub Security Advisories affecting the npm package cyberchef, with affected version ranges, CVSS severity, EPSS exploit prediction, and CISA KEV status.

CVEs (2)

• CVE-2026-42615 — CVSS 7.2 (high): GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.
• CVE-2019-15532 — CVSS 6.1 (medium): CyberChef before 8.31.2 allows XSS in core/operations/TextEncodingBruteForce.mjs.