CVE-2026-42615
HIGH7.2EPSS 0.01%CyberChef has a Cross-site Scripting issue
Published: 4/29/2026Modified: 5/6/2026
Also known as:GHSA-h4hv-92pp-pcjg
Description
GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.
Affected packages (1)
- npm/cybercheffrom 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 |
References (6)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-42615
- PATCHhttps://github.com/gchq/CyberChef
- WEBhttps://github.com/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d
- WEBhttps://github.com/gchq/CyberChef/compare/v10.24.0...v11.0.0
- WEBhttps://github.com/gchq/CyberChef/issues/2344
- WEBhttps://github.com/gchq/CyberChef/pull/2346