CVE-2026-42615
High
Description
GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.
SeverityHigh
CVSS7.2
Exploit probability—
ProductCyberchef
PublishedApr 29, 2026
First seenApr 29, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- cyberchef11.0.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cyberchefnpm | v < 11.0.0 | 11.0.0 |
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