{"id":"CVE-2026-42615","aliases":["EUVD-2026-26191","GHSA-h4hv-92pp-pcjg"],"status":"published","title":"CyberChef has a Cross-site Scripting issue","description":"GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.","severity":{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00294,"percentile":0.22309,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-04-29T02:55:53Z","modified":"2026-10-28T02:30:33Z","fixes":[{"ecosystem":"npm","package":"cyberchef","fixed_in":["11.0.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"cyberchef","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11.0.0"}]}]},{"source":"osv","ecosystem":"npm","package":"cyberchef","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"11.0.0"}]}]}],"products":[{"vendor":"gchq","product":"cyberchef"}],"references":[{"url":"https://github.com/gchq/CyberChef/issues/2344","tags":["report","web"]},{"url":"https://github.com/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d","tags":["fix","web"]},{"url":"https://github.com/gchq/CyberChef/compare/v10.24.0...v11.0.0","tags":["web"]},{"url":"https://github.com/gchq/CyberChef/pull/2346","tags":["fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42615","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-h4hv-92pp-pcjg"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42615.json","tags":["advisory"]},{"url":"https://github.com/gchq/CyberChef","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-42615","description":"GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.","status":"published","published":"2026-04-29T02:55:53.171Z","modified":"2026-04-29T13:14:40.068Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:40:23.731501Z"}],"euvd":[{"id":"EUVD-2026-26191","description":"GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.","status":"published","published":"2026-04-29T02:55:53Z","modified":"2026-04-29T13:14:40Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high"}],"updated_at":"2026-11-02T19:05:19.922616Z"}],"ghsa":[{"id":"GHSA-h4hv-92pp-pcjg","title":"CyberChef has a Cross-site Scripting issue","description":"GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.","status":"published","published":"2026-04-29T06:33:30Z","modified":"2026-05-06T22:09:28Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:40:02.883746Z"}],"nvd":[{"id":"CVE-2026-42615","description":"GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.","status":"published","published":"2026-04-29T04:16:41.75Z","modified":"2026-07-24T20:10:00.147Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:16.626888Z"}],"osv":[{"id":"CVE-2026-42615","description":"GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.","status":"published","published":"2026-04-29T02:55:53.171Z","modified":"2026-10-28T02:30:33.032428757Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:04.117819Z"},{"id":"GHSA-h4hv-92pp-pcjg","title":"CyberChef has a Cross-site Scripting issue","description":"GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.","status":"published","published":"2026-04-29T06:33:30Z","modified":"2026-05-06T22:26:25.542009Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:48.546324Z"}]}}