Prototype pollution in i18next-fs-backend - CVE-2026-48713
Published: September 9, 2026
Vulnerability identifier: #VU148438
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-48713
CWE-ID: CWE-1321
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary JavaScript code.
The vulnerability exists due to prototype pollution via crafted missing-key strings when used to persist missing translation keys (e.g. via i18next-http-middleware's missingKeyHandler exposed to untrusted input). A remote attacker can pass specially crafted input to the application and perform prototype pollution, which can result in information disclosure or data manipulation.
Affected software
i18next-fs-backend
DataStage on Cloud Pak for Data
DataStage on Cloud Pak for Data
How to mitigate CVE-2026-48713
Cybersecurity Help is currently unaware of any official solution to address this vulnerability..
i18next-fs-backend - update to 2.6.6
DataStage on Cloud Pak for Data - addressed in versions 5.3.1 patch 10, 5.4 patch 5
DataStage on Cloud Pak for Data - addressed in versions 5.3.1 patch 10, 5.4 patch 5