CVE-2026-57439
CyberChef is a web app for encryption, encoding, compression, and data analysis. Prior to 11.2.0, the Series Chart operation accepts __proto
CVSS
5.0
Medium
EPSS
0.1%
p1
KEV
—
Exploit Today
0
0-100
Published: Jul 8, 2026 · Last modified: Jul 10, 2026 · CWE-79 · CWE-1321
0.1%EPSS · 30 days0.1%
2026-07-092026-07-16
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.
- github.comhttps://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f
- github.comhttps://github.com/gchq/CyberChef/issues/2568
- github.comhttps://github.com/gchq/CyberChef/pull/2569
- github.comhttps://github.com/gchq/CyberChef/releases/tag/v11.2.0
- github.comhttps://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c
- github.comhttps://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c
CVECVSSEPSSKEVRExploitTitleMod.
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