# CVE-2026-42615

> Vulnerability · severity: **HIGH** (CVSS 7.2).

## Description

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

## Key facts

- **CVE ID:** CVE-2026-42615
- **Published:** 2026-04-29
- **CVSS severity:** HIGH
- **CVSS base score:** 7.2
- **CWE codes:** CWE-79

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42615

## Citation

> AI Analytics. CVE-2026-42615. Retrieved 2026-08-02 from https://api.ai-analytics.org/cve/CVE-2026-42615. Derived from NIST NVD. Licensed CC0.

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