CVE-2026-42615: GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the...
HIGH
CVSS 7.2
Exploit Available
2 PoC
Published: April 29, 2026 | Last Modified: April 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.
Ghostwire Analysis — What This Means Practically
- High CVSS score indicates significant risk — exploitation could lead to substantial data exposure or system compromise.
- 2 proof-of-concept exploits available on GitHub. Public exploit code lowers the barrier for both researchers and attackers.
This analysis is generated by Ghostwire from NVD, CISA KEV, EPSS, and open-source intelligence data. Verify findings through primary sources before acting.
Proof-of-Concept Exploits (2)
Security Coverage (1 articles)
References