CVE-2026-42615

State: Published
Severity: 7.2 High
Published: Apr 29, 2026
Updated: Apr 29, 2026
Reserved: Apr 29, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	7.2 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N	mitre

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Affected Products

Product	Versions
CyberChefGCHQ	before 11.0.0Affected

References

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

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