# CVE-2026-89307: HTML injection allows open redirection in WordPress theme design-scuole-wordpress-theme

> An authenticated attacker can inject HTML to redirect users to malicious sites via the sign parameter in the Design Scuole Italia WordPress theme.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Sep 2026
- **Updated:** 15 Sep 2026
- **Also known as:** GHSA-wfjc-xr6c-c6vw

## What is CVE-2026-89307?

CVE-2026-89307 is a medium-severity vulnerability in Developers Italia design-scuole-wordpress-theme, published on 15 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

The "Firma Circolare" feature in the "Design Scuole Italia" WordPress theme allows an authenticated attacker to inject arbitrary HTML via the sign parameter, enabling forced redirection of visiting users to an attacker-controlled URL (Stored HTML Injection / Open Redirect).

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2026-89307?


## How do I fix CVE-2026-89307?

No fix has been published for CVE-2026-89307 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-89307 being exploited?

There is no known exploitation of CVE-2026-89307 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89307 and fix it if it is affected.

What it is: CVE-2026-89307 is a medium-severity vulnerability in Developers Italia design-scuole-wordpress-theme, published on 15 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-89307 in the wild and no public exploit code.

Affected product: Developers Italia design-scuole-wordpress-theme. 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-2026-89307/ (Markdown: https://insights.sbomify.com/CVE-2026-89307/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89307
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89307
- OSV: https://osv.dev/vulnerability/CVE-2026-89307

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-89307/
Summaries are generated and may contain mistakes; the official description above is the record.