# CVE-2026-112945: Vite: Cross origin script execution through Vite custom middleware


- **Severity:** Low 2.1 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 20 Oct 2026
- **Updated:** 28 Oct 2026
- **Also known as:** ECHO-2b64-1afa-7929, GHSA-9jrq-w75r-8gcw, UBUNTU-CVE-2026-112945

## What is CVE-2026-112945?

CVE-2026-112945 is a low-severity vulnerability in vitejs vite, published on 20 Oct 2026. 

### Official description

Vite is a frontend tooling framework for JavaScript. Prior to 6.4.4, 7.3.7, 8.1.6, 8.2.4, and 8.3.3, applications using custom middleware are vulnerable when they pass an unchanged browser request URL to server.transformIndexHtml. getHtmlFilename uses the query-bearing request URL to resolve an existing local file while preserving attacker-supplied leading slashes in the generated proxy module URL. If the transformed HTML contains an inline module script and a victim browser loads the crafted development-server page, the leading double slash makes the browser fetch and execute an attacker-controlled module in the Vite-served page. This execution can expose sensitive page data or permit critical actions available to the affected application. This issue is fixed in versions 6.4.4, 7.3.7, 8.1.6, 8.2.4, and 8.3.3.

Weakness: CWE-80 (Improper Neutralization of Script-Related HTML Tags in a Web Page)

## Which versions are affected by CVE-2026-112945?

12 open source packages ship an affected version, including vite and vite-plus.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `vite` | npm | All versions | 6.4.4 |
| `vite` | npm | All versions | 6.4.4 |
| `vite` | npm | From 7.0.0 | 7.3.7 |
| `vite` | npm | From 7.0.0 | 7.3.7 |
| `vite` | npm | From 8.0.0 | 8.1.6 |
| `vite` | npm | From 8.0.0 | 8.1.6 |
| `vite` | npm | From 8.2.0 | 8.2.4 |
| `vite` | npm | From 8.2.0 | 8.2.4 |
| `vite` | npm | From 8.3.0 | 8.3.3 |
| `vite` | npm | From 8.3.0 | 8.3.3 |
| `vite-plus` | npm | All versions | 1.1.0 |
| `vite-plus` | npm | All versions | 1.1.0 |

## How do I fix CVE-2026-112945?

Upgrade vite to a fixed version for your release line: 6.4.4, 7.3.7, 8.1.6 or 8.2.4.

## Is CVE-2026-112945 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-112945 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-112945 and fix it if it is affected.

What it is: CVE-2026-112945 is a low-severity vulnerability in vitejs vite, published on 20 Oct 2026. 
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-112945 exists.

Affected packages and fixed versions:
- vite (npm): affected all versions; fixed in 6.4.4
- vite (npm): affected all versions; fixed in 6.4.4
- vite (npm): affected from 7.0.0; fixed in 7.3.7
- vite (npm): affected from 7.0.0; fixed in 7.3.7
- vite (npm): affected from 8.0.0; fixed in 8.1.6
- vite (npm): affected from 8.0.0; fixed in 8.1.6
- vite (npm): affected from 8.2.0; fixed in 8.2.4
- vite (npm): affected from 8.2.0; fixed in 8.2.4
- vite (npm): affected from 8.3.0; fixed in 8.3.3
- vite (npm): affected from 8.3.0; fixed in 8.3.3
- vite-plus (npm): affected all versions; fixed in 1.1.0
- vite-plus (npm): affected all versions; fixed in 1.1.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-112945/ (Markdown: https://insights.sbomify.com/CVE-2026-112945/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-112945
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-112945
- OSV: https://osv.dev/vulnerability/CVE-2026-112945

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-112945/
Summaries are generated and may contain mistakes; the official description above is the record.