Vulnerability · Published Oct 23, 2026 · Assigned by VulnCheck
CVE-2026-115730i18next-http-backend 4.0.2 Protocol-Relative URL Injection via Namespace in interpolateUrl
Low 3.1
In plain English
A low-severity injection in i18next-http-backend from i18next. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | node-i18next-http-backend | no fix listed | UBUNTU-CVE-2026-115730 |
| Ubuntu:24.04:LTS | node-i18next-http-backend | no fix listed | UBUNTU-CVE-2026-115730 |
| Ubuntu:26.04:LTS | node-i18next-http-backend | no fix listed | UBUNTU-CVE-2026-115730 |
| Ubuntu:26.10 | node-i18next-http-backend | no fix listed | UBUNTU-CVE-2026-115730 |
| npm | i18next-http-backend | 4.0.3 | GHSA-9jhj-wvmw-cfx5 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| i18next | i18next-http-backend | 4.0.2 – before 4.0.3 |
Weakness: CWE-74 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
References
- GitHub Security Advisory (GHSA-9jhj-wvmw-cfx5) vendor-advisory
- https://github.com/i18next/i18next-http-backend/commit/042c3d4e4e9d73b2ae3aa76b22cb45d48f1e35b7 patch
- GitHub Security Advisory (GHSA-xvq9-wjp8-hwqf) related, vendor-advisory
- VulnCheck Advisory: i18next-http-backend 4.0.2 Protocol-Relative URL Injection via Namespace in interpolateUrl third-party-advisory