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

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
GCHQ CyberChef unaffected
Version Status Constraints
0 affected < 11.0.0

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Gchq Subscribe
Cyberchef Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d cve-icon
https://github.com/gchq/CyberChef/compare/v10.24.0...v11.0.0 cve-icon
https://github.com/gchq/CyberChef/issues/2344 cve-icon
https://github.com/gchq/CyberChef/pull/2346 cve-icon
History

Wed, 29 Apr 2026 03:45:00 +0000

Type Values Removed Values Added
Description GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.
First Time appeared Gchq
Gchq cyberchef
Weaknesses CWE-79
CPEs cpe:2.3:a:gchq:cyberchef:*:*:*:*:*:*:*:*
Vendors & Products Gchq
Gchq cyberchef
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-04-29T02:56:14.260Z

Reserved: 2026-04-29T02:55:52.684Z

Link: CVE-2026-42615

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses