{"id":"GHSA-h4hv-92pp-pcjg","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.","aliases":["CVE-2026-42615"],"modified":"2026-05-06T22:26:25.542009Z","published":"2026-04-29T06:33:30Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-05-06T22:09:27Z","nvd_published_at":"2026-04-29T04:16:41Z","cwe_ids":["CWE-79"]},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42615"},{"type":"WEB","url":"https://github.com/gchq/CyberChef/issues/2344"},{"type":"WEB","url":"https://github.com/gchq/CyberChef/pull/2346"},{"type":"WEB","url":"https://github.com/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d"},{"type":"PACKAGE","url":"https://github.com/gchq/CyberChef"},{"type":"WEB","url":"https://github.com/gchq/CyberChef/compare/v10.24.0...v11.0.0"}],"affected":[{"package":{"name":"cyberchef","ecosystem":"npm","purl":"pkg:npm/cyberchef"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"11.0.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-h4hv-92pp-pcjg/GHSA-h4hv-92pp-pcjg.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"}]}