{"cve":"CVE-2026-42615","nvd":{"published":"2026-04-29T04:16:41.750","modified":"2026-07-24T20:10:00.147","status":"Awaiting Analysis","description":"GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","score":7.2},"cwes":["CWE-79"],"references":["https://github.com/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d","https://github.com/gchq/CyberChef/compare/v10.24.0...v11.0.0","https://github.com/gchq/CyberChef/issues/2344","https://github.com/gchq/CyberChef/pull/2346"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:33:09.003606135+00:00"},"epss":{"cve":"CVE-2026-42615","score":0.00294,"percentile":0.22102,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-h4hv-92pp-pcjg","url":"https://osv.dev/vulnerability/GHSA-h4hv-92pp-pcjg","summary":"CyberChef has a Cross-site Scripting issue","modified":"2026-05-06T22:26:25.542009Z","packages":[{"ecosystem":"npm","name":"cyberchef","purl":"pkg:npm/cyberchef","ranges":["<11.0.0"],"fixed":["11.0.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}