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Vulnerability record · CVE-2026-42615 · published 29 April 2026

CVE-2026-42615: Cross-site scripting vulnerability

GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.

7.2 CVSS 3.1 High EPSS 0.37% · top 72.1% CWE-79 · Cross-site scripting Awaiting Analysis
7.2CVSS 3.1 base score
0.37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
24 Jul 2026Last modified by NVD

Description

GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-42615), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.