{"id":"CVE-2026-115730","published":"2026-10-23T12:55:09Z","modified":"2026-10-29T13:19:15Z","title":"i18next-http-backend 4.0.2 Protocol-Relative URL Injection via Namespace in interpolateUrl","vendor":"i18next","product":"i18next-http-backend","tier":"tail","description":{"text":"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.","provenance":"source","from":"CVE.org"},"cvss":{"score":3.1,"severity":"LOW","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00318,"percentile":0.24802,"provenance":"source"},"cwes":[{"id":"CWE-74","name":"Improper Neutralization of Special Elements in Output Used by a Downstream Component"}],"references":[{"url":"https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-9jhj-wvmw-cfx5","tags":["vendor-advisory"]},{"url":"https://github.com/i18next/i18next-http-backend/commit/042c3d4e4e9d73b2ae3aa76b22cb45d48f1e35b7","tags":["patch"]},{"url":"https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-xvq9-wjp8-hwqf","tags":["related","vendor-advisory"]},{"url":"https://www.vulncheck.com/advisories/i18next-http-backend-4.0.2-protocol-relative-url-injection-via-namespace-in-interpolateurl","tags":["third-party-advisory"]}],"priority":{"score":7.1,"factors":[{"name":"EPSS percentile","points":4.96},{"name":"CVSS severity","points":2.17}]},"vendorSlug":"i18next","affectedVersions":[{"vendor":"i18next","product":"i18next-http-backend","versions":[">= 4.0.2, < 4.0.3"]}],"affected":[{"ecosystem":"npm","package":"i18next-http-backend","vulnerableRanges":["<4.0.3"],"patched":["4.0.3"],"from":["GHSA-9jhj-wvmw-cfx5"],"provenance":"source"}],"euvd":{"id":"EUVD-2026-108941","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-i18next-http-backend-cve-2026-41691","parents":[{"from":"CVE-2026-105800","to":"CVE-2026-115730","relation":"successor","confidence":"high","kind":"lineage","evidence":[{"kind":"osv-related","provenance":"source","id":"GHSA-xvq9-wjp8-hwqf","via":"related"},{"kind":"version-step","provenance":"source","package":"npm:i18next-http-backend","fromFixed":"4.0.2","toFixed":"4.0.3","daysApart":17},{"kind":"similar","provenance":"machine","score":0.42,"basis":"same product + CWE + description similarity"}]}],"packageHistory":[{"cve":"CVE-2026-41691","published":"2026-05-07","fixed":"3.0.5","kev":false},{"cve":"CVE-2026-105800","published":"2026-10-06","fixed":"4.0.2","kev":false},{"cve":"CVE-2026-115730","published":"2026-10-23","fixed":"4.0.3","kev":false},{"cve":"CVE-2026-118258","published":"2026-10-28","fixed":"4.0.4","kev":false,"link":{"from":"CVE-2026-115730","to":"CVE-2026-118258","relation":"successor","confidence":"medium","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"npm:i18next-http-backend","fromFixed":"4.0.3","toFixed":"4.0.4","daysApart":5},{"kind":"similar","provenance":"machine","score":0.48,"basis":"same product + CWE + description similarity"}]}}],"package":"npm:i18next-http-backend"}}