CVE-2026-42615

7.2 highEPSS 0.3%

High (7.2). EPSS 0.3% chance of exploitation in the next 30 days. Fixed in cyberchef 11.0.0.

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

Severity

7.2 high

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

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 22% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-04-29
Modified: 2026-07-24
Record from: the NVD, synced 2026-10-19

Advisory	Ecosystem	Package	Affected	Fixed in
GHSA-h4hv-92pp-pcjg	npm	cyberchef	<11.0.0	11.0.0