Vulnerability Description
GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.
CVSS Score
7.2
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Related Weaknesses (CWE)
References
- https://github.com/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4
- 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
FAQ
What is CVE-2026-42615?
CVE-2026-42615 is a vulnerability with a CVSS score of 7.2 (HIGH). GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.
How severe is CVE-2026-42615?
CVE-2026-42615 has been rated HIGH with a CVSS base score of 7.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42615?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.