CVE-2026-42615
Published:April 29, 2026
Updated:May 18, 2026
GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.
Affected Packages
https://github.com/gchq/CyberChef.git (GITHUB):
Affected version(s) >=v5.0.0 <v11.0.0Fix Suggestion:
Update to version v11.0.0cyberchef (NPM):
Affected version(s) >=4.0.0 <11.0.0Fix Suggestion:
Update to version 11.0.0cyberchef (NPM):
Affected version(s) >=4.0.0 <11.0.0Fix Suggestion:
Update to version 11.0.0Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.2
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
EPSS
Base Score:
0.01