CVE-2026-57439

mediumCVSS 5covered by 1 sourcefirst seen 2026-07-08

CyberChef is a web app for encryption, encoding, compression, and data analysis. Prior to 11.2.0, the Series Chart operation accepts proto as a key while parsing user-supplied CSV, allowing prototype pollution that can be chained with operations such as Parse UDP to inject malicious JavaScript into HTML output. This issue is fixed in version 11.2.0.

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Exploitation outlook

Low exploitation risk0.09% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-57439: CyberChef is a web app for encryption, encoding, compression, and data analysis. Prior to 11.2…nvd · 2026-07-08

External references

NVD record for CVE-2026-57439

CVE.org record

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