What’s Vulnerable › Vulnerabilities

CVE-2026-42615

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-29 · updated 2026-07-24
• Weakness: CWE-79

Description

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

Affected products

• gchq CyberChef: before 11.0.0 — fixed in 11.0.0

How to fix

Upgrade to a fixed version: gchq CyberChef 11.0.0. Check the vendor advisory for mitigations.

References

• https://github.com/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d
• https://github.com/gchq/CyberChef/compare/v10.24.0...v11.0.0
• https://github.com/gchq/CyberChef/issues/2344
• https://github.com/gchq/CyberChef/pull/2346

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