GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.
{
"cna_assigner": "mitre",
"cwe_ids": [
"CWE-79"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42615.json"
}{
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "11.0.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"fixed": "9641ae07f92e9af50f10e978385465b2f4a36c4d"
}
],
"source": "REFERENCES_COMMIT"
}
]
}