What’s Vulnerable › Vulnerabilities

CVE-2026-115730: i18next-http-backend 4.0.2 Protocol-Relative URL Injection via Namespace in interpolateUrl

• Severity: low (CVSS 3.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-23 · updated 2026-10-29
• Weakness: CWE-74

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.

Affected products

• i18next-http-backend: from 4.0.2 before 4.0.3 — fixed in 4.0.3

How to fix

Upgrade to a fixed version: i18next-http-backend 4.0.3. Check the vendor advisory for mitigations.

References

• https://github.com/i18next/i18next-http-backend/commit/042c3d4e4e9d73b2ae3aa76b22cb45d48f1e35b7
• https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-9jhj-wvmw-cfx5
• https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-xvq9-wjp8-hwqf
• https://www.vulncheck.com/advisories/i18next-http-backend-4.0.2-protocol-relative-url-injection-via-namespace-in-interpolateurl
• https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-9jhj-wvmw-cfx5

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