CVE-2026-42615
HighCVSS 7.2Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
GCHQ CyberChef before version 11.0.0 contains an XSS vulnerability via the Show Base64 offsets function, allowing script injection.
Risk Assessment
An attacker can execute malicious scripts in the victim's browser, potentially leading to session theft or data theft.
Recommendation
Update CyberChef to version 11.0.0 or later.
Other vulnerabilities in CyberChef
See all- CVE-2026-72912Medium
CyberChef prior to 11.3.0 has a client-side CPU exhaustion vulnerability in the pretty-recipe parser in src/core/Utils.mjs when a malformed #recipe= URL fragment containing a large number of unmatched quote characters reaches Utils.parseRecipeConfig(). The function synchronously applies a complex global regular expression that may perform heavy backtracking before rejecting the input, causing the victim's browser tab to freeze during startup for seconds or longer. No code execution, data exfiltration, or privilege escalation occurs.
- CVE-2026-57439Medium
CyberChef before version 11.2.0 contains a prototype pollution vulnerability in the Series Chart operation, which accepts the __proto__ key when parsing user-supplied CSV. This can be chained with other operations like Parse UDP to inject malicious JavaScript into HTML output.
Original NVD description (English source)
GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.