# CVE-2026-8865: Cross-site scripting in Avalon23 Products Filter for WooCommerce

> Authenticated attackers can inject arbitrary scripts via shortcode attributes in the Avalon23 Products Filter plugin, affecting WordPress sites.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Jun 2026
- **Updated:** 25 Jun 2026
- **Also known as:** GHSA-hxr4-2fcj-gcw3

## What is CVE-2026-8865?

CVE-2026-8865 is a medium-severity cross-site scripting vulnerability in paradigmatools Avalon23 Products Filter for WooCommerce, published on 24 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Avalon23 Products Filter for WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'avalon23_qr' shortcode in all versions up to, and including, 1.1.6. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes (notably 'title' and 'fixed_link') which are concatenated directly into single-quoted HTML attributes by the AVALON23_HELPER::draw_html_item() helper without esc_attr() or any other encoding. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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

## Which versions are affected by CVE-2026-8865?


## How do I fix CVE-2026-8865?

No fix has been published for CVE-2026-8865 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-8865 being exploited?

There is no known exploitation of CVE-2026-8865 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-8865 and fix it if it is affected.

What it is: CVE-2026-8865 is a medium-severity cross-site scripting vulnerability in paradigmatools Avalon23 Products Filter for WooCommerce, published on 24 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-8865 in the wild and no public exploit code.

Affected product: paradigmatools Avalon23 Products Filter for WooCommerce. 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-2026-8865/ (Markdown: https://insights.sbomify.com/CVE-2026-8865/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-8865
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-8865
- OSV: https://osv.dev/vulnerability/CVE-2026-8865

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-8865/
Summaries are generated and may contain mistakes; the official description above is the record.