Cross-Site Scripting in i18next

published 2018-05-29 8 y ago modified 2026-06-17 4 mo ago also GHSA-cmh5-qc8w-xvcq , EUVD-2018-0260

cvss: 6.1; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits: 0; none known

i18next is a language translation framework. When using the .init method, passing interpolation options without passing an escapeValue will default to undefined rather than the assumed true. This can result in a cross-site scripting vulnerability because user input is assumed to be escaped, but is not. This vulnerability affects i18next 2.0.0 and later.

Patch / fix

fixed in 1

npm i18next 3.4.4

Exploit prediction

0.98% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/i18next/i18next/pull/826 referenced PoC, tagged "exploit" by a source, unverified
nodesecurity.io https://nodesecurity.io/advisories/326 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	6.1	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub	3.0	6.1	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	i18next	>=2.0.0, <3.4.4	3.4.4

Affected products

HackerOne i18next node module

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /i18next/i18next/pull/826
web, exploit, issue-tracking, third-party-advisory
nodesecurity.io /advisories/326
exploit, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2017-16010
advisory
github.com /advisories/GHSA-cmh5-qc8w-xvcq
advisory
npmjs.com /advisories/326
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary