PT-2026-56483 · Gchq · Cyberchef

Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-57439

NVD

CVSS v3.1

5.0

Medium

Base vector

AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

Exploit

Fix

XSS

Prototype Pollution

Weakness Enumeration

CWE-79

CWE-1321

Related Identifiers

CVE-2026-57439

Affected Products

Cyberchef

References · 6

• 🔥 https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-57439 · Security Note
• https://github.com/gchq/CyberChef/pull/2569 · Note
• https://github.com/gchq/CyberChef/releases/tag/v11.2.0 · Note
• https://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f · Note
• https://github.com/gchq/CyberChef/issues/2568 · Note