Is CVE-2026-42615 actively exploited?

No active exploitation of CVE-2026-42615 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42615 be exploited remotely?

Yes. CVE-2026-42615 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42615?

CVE-2026-42615 has a CVSS score of 7.2 (HIGH).

HOME VULNERABILITIESCVE-2026-42615

HIGH

CVE-2026-42615

CWE-79Published: April 29, 2026· Updated: Apr 30, 2026

7.2

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:1.1th

Official Description

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

NVD Source

Technical Analysis

CVE-2026-42615 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.