# CVE-2021-20735: Cross-site scripting in ETUNA EC-CUBE plugins

> Remote attackers can inject arbitrary scripts via the management page of ETUNA EC-CUBE delivery slip plugins, potentially compromising admin sessions.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 22 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-p393-fh7c-vh28

## What is CVE-2021-20735?

CVE-2021-20735 is a medium-severity cross-site scripting vulnerability in ETUNA EC-CUBE plugins, published on 22 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Cross-site scripting vulnerability in ETUNA EC-CUBE plugins (Delivery slip number plugin (3.0 series) 1.0.10 and earlier, Delivery slip number csv bulk registration plugin (3.0 series) 1.0.8 and earlier, and Delivery slip number mail plugin (3.0 series) 1.0.8 and earlier) allows remote attackers to inject an arbitrary script by executing a specific operation on the management page of EC-CUBE.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-20735?

It affects 3 products.


Products: Ec-Cube Delivery Slip Number, Ec-Cube Delivery Slip Number Csv Bulk Registration, Ec-Cube Delivery Slip Number Mail.

## How do I fix CVE-2021-20735?

No fix has been published for CVE-2021-20735 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20735 being exploited?

There is no known exploitation of CVE-2021-20735 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20735 and fix it if it is affected.

What it is: CVE-2021-20735 is a medium-severity cross-site scripting vulnerability in ETUNA EC-CUBE plugins, published on 22 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-20735 in the wild and no public exploit code.

Affected product: ETUNA EC-CUBE plugins. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2021-20735/ (Markdown: https://insights.sbomify.com/CVE-2021-20735/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20735
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20735
- OSV: https://osv.dev/vulnerability/CVE-2021-20735

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20735/
Summaries are generated and may contain mistakes; the official description above is the record.