{"id":"CVE-2026-42615","aliases":["GHSA-h4hv-92pp-pcjg"],"url":"https://o3.security/vulnerability/CVE-2026-42615","summary":"CyberChef has a Cross-site Scripting issue","details":"GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.","published":"2026-04-29T02:55:53.171Z","modified":"2026-08-12T03:51:21.521199555Z","cvss":{"score":7.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"},"epss":{"score":0.00294,"percentile":0.21863,"asOf":"2026-08-14"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"cyberchef","fixedVersion":"11.0.0"}],"fix":{"url":"https://github.com/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d","label":"gchq/CyberChef@9641ae0"},"references":[{"type":"WEB","url":"https://github.com/gchq/CyberChef/compare/v10.24.0...v11.0.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42615.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42615"},{"type":"REPORT","url":"https://github.com/gchq/CyberChef/issues/2344"},{"type":"FIX","url":"https://github.com/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d"},{"type":"FIX","url":"https://github.com/gchq/CyberChef/pull/2346"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:21.521199555Z"}}