CVE-2026-115730: i18next-http-backend: Namespace value starting with / forms a protocol-relative URL when loadPath/addPath places {{ns}} right after a / (bypass of the // check added for GHSA-xvq9-wjp8-hwqf)

CVE-2026-115730 · Severity: low · CVSS 3.1 · Published 2026-10-23

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.

Technologies: i18next-http-backend (npm). Vendors: npm.

Quick answers

Is CVE-2026-115730 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-115730 being exploited in the wild.
How severe is CVE-2026-115730?
Low severity, with a CVSS score of 3.1, published 23 October 2026.
Which products and versions are affected?
i18next-http-backend (npm) < 4.0.3, SEMVER:introduced=0,fixed=4.0.3.
Is there a fix for CVE-2026-115730?
Yes. i18next-http-backend (npm): upgrade to 4.0.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-115730?
Check whether you run i18next-http-backend (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • i18next-http-backend (npm): upgrade to 4.0.3 or later
    npm install i18next-http-backend@4.0.3

Affected products

  • i18next-http-backend (npm) < 4.0.3, SEMVER:introduced=0,fixed=4.0.3

Identifiers

  • CVE-2026-115730
  • GHSA-9jhj-wvmw-cfx5

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