CVE-2026-57439
MEDIUMCVSS v3.1: 5.0
Source data as of:
At a glance
- Severity
- MEDIUM
- CVSS
- 5.0 v3.1 · NVD
- EPSS
- EPSS not provided by FIRST.org for this CVE
- CISA KEV
- No
- Type
- XSS · NVD CWE
- Attack conditions (CVSS vector)
- No privileges · Source: NVD Vector
- Published
- 2026-07-08 · Modified: 2026-07-08
- References
- Jump to references (5)
CVSS / EPSS / KEV
Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources
Description
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.
References
Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.
- Patch https://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f
- Reference https://github.com/gchq/CyberChef/issues/2568
- Reference https://github.com/gchq/CyberChef/pull/2569
- Patch https://github.com/gchq/CyberChef/releases/tag/v11.2.0
- Vendor advisory https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c