CVE-2026-42615
CyberChef has a Cross-site Scripting issue
7.2
HIGH
CVSS 3.1
EPSS 0.01%
Description
GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.
How to fix CVE-2026-42615
To remediate CVE-2026-42615, upgrade the affected package to a fixed version below.
- npm/cyberchef—upgrade to 11.0.0 or later
Is CVE-2026-42615 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 11.0.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |