PT-2026-35866 · Gchq · Cyberchef

Published 2026-04-29 · Updated 2026-04-29 · CVE-2026-42615

X.com · Cvenew

CVSS v3.1

7.2

High

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

CVE-2026-42615 GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show Base64 offsets('%3Cscript substring. https://t.co/DQZVHm0twJ

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-42615

Affected Products

Cyberchef

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-42615 · Security Note
• https://github.com/gchq/CyberChef/compare/v10.24.0...v11.0.0 · Note
• https://github.com/gchq/CyberChef/issues/2344 · Note
• https://github.com/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d · Note
• https://github.com/gchq/CyberChef/pull/2346 · Note
• https://twitter.com/VulmonFeeds/status/2049347535567790181 · Twitter Post
• https://twitter.com/CVEnew/status/2049350420171264009 · Twitter Post