CVE-2026-42615

HIGH

GCHQ CyberChef < 11.0.0 - Cross-Site Scripting via Show Base64 Offsets

Title source: llm
STIX 2.1

Description

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

References (4)

Core 4

Scores

CVSS v3 7.2
EPSS 0.0029
EPSS Percentile 20.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (2)
GCHQ/CyberChef < 11.0.0
npm/cyberchef 0 - 11.0.0npm
Published Apr 29, 2026
Tracked Since Apr 29, 2026