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PatchSiren cyber security CVE debrief

CVE-2026-115730 i18next CVE debrief

PatchSiren debrief for CVE-2026-115730: i18next-http-backend 4.0.2 Protocol-Relative URL Injection via Namespace in interpolateUrl. This vulnerability allows attackers to redirect translation requests by supplying an ns value starting with a slash, potentially leading to UI content injection and cross-site scripting attacks. Developers and administrators using i18next-http-backend version 4.0.2 should assess exposure and prioritize upgrading to version 4.0.3 or later to mitigate potential risks.

Vendor
i18next
Product
i18next-http-backend
CVSS
LOW 2.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-23
Original CVE updated
2026-10-29
Advisory published
2026-10-23
Advisory updated
2026-10-29

Who should care

Developers and administrators using i18next-http-backend version 4.0.2 should assess exposure and prioritize upgrading to version 4.0.3 or later to mitigate potential UI content injection and cross-site scripting attacks.

Why it matters

CVE-2026-115730 is a low-severity vulnerability in i18next-http-backend 4.0.2 that allows attackers to redirect translation requests, potentially leading to UI content injection and cross-site scripting attacks. Developers and administrators should assess exposure and prioritize upgrading to version 4.0.3 or later.

  • Potential UI content injection and cross-site scripting attacks
  • Need to verify inventory and assess exposure for i18next-http-backend version 4.0.2
  • Prioritize upgrading to version 4.0.3 or later to mitigate vulnerability

Technical summary

The i18next-http-backend package 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. This can lead to UI content injection and cross-site scripting attacks. Developers and administrators should assess exposure and prioritize upgrading to version 4.0.3 or later to mitigate potential risks. The vulnerability has a CVSS score of 2.3 and is considered low-severity. Affected systems may be vulnerable to UI content injection and cross-site scripting attacks if not properly mitigated.

Defensive priority

Assess exposure and verify inventory for i18next-http-backend version 4.0.2; prioritize upgrading to version 4.0.3 or later.

Recommended defensive actions

  • Assess exposure and verify inventory for i18next-http-backend version 4.0.2
  • Prioritize upgrading to version 4.0.3 or later
  • Monitor for potential UI content injection and cross-site scripting attacks
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability in i18next-http-backend 4.0.2. The NVD entry is currently LOW with a CVSS score of 2.3. Evidence is limited, and defenders should verify inventory for i18next-http-backend version 4.0.2, assess exposure, and monitor for potential UI content injection and cross-site scripting attacks.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-115730 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-115730

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-115730 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-115730

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • i18next-http-backend 4.0.2 Protocol-Relative URL Injection via Namespace in interpolateUrl

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/115xxx/CVE-2026-115730.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-9jhj-wvmw-cfx5

    Supplemental source - vendor-advisory

  • Source reference

    Unverified legacy reference

    URL: https://github.com/i18next/i18next-http-backend/commit/042c3d4e4e9d73b2ae3aa76b22cb45d48f1e35b7

    Supplemental source - patch

  • Source reference

    Unverified legacy reference

    URL: https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-xvq9-wjp8-hwqf

    Supplemental source - related, vendor-advisory

  • Source reference

    Unverified legacy reference

    URL: https://www.vulncheck.com/advisories/i18next-http-backend-4.0.2-protocol-relative-url-injection-via-namespace-in-interpolateurl

    Supplemental source - third-party-advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.