Low severity · published Oct 23, 2026
CVE-2026-115730
i18next-http-backend 4.0.2 Protocol-Relative URL Injection via Namespace in interpolateUrl
New
3.1
CVSS
0.2%
EPSS
No
On KEV
Description
i18next-http-backend 4.0.2 contains an incomplete fix in interpolateUrl() that allows attackers to redirect translation requests by supplying an ns value starting with a slash. Attackers controlling the namespace value can form a protocol-relative URL in loadPath or addPath templates to load attacker-hosted translations, enabling UI content injection and cross-site scripting.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
I1
i18next-http-backend · i18next
4.0.2 before 4.0.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-115730
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-115730
github.com
https://github.com/i18next/i18next-http-backend/commit/042c3d4e4e9d73b2ae3aa76b22cb45d48f1e35b7
github.com
https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-9jhj-wvmw-cfx5
github.com
https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-xvq9-wjp8-hwqf
www.vulncheck.com
https://www.vulncheck.com/advisories/i18next-http-backend-4.0.2-protocol-relative-url-injection-via-namespace-in-interpolateurl
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i18next-http-backend incomplete URL validation permits SSRF