# CVE-2026-87869: Cross-site scripting in Filter Everything — WordPress & WooCommerce Filters

> Unauthenticated attackers can inject arbitrary scripts via crafted links in the Filter Everything plugin, potentially executing code in victim browsers.

- **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:** 10 Oct 2026
- **Updated:** 11 Oct 2026
- **Also known as:** GHSA-g983-662m-2fg8

## What is CVE-2026-87869?

CVE-2026-87869 is a medium-severity cross-site scripting vulnerability in stepasyuk Filter Everything — WordPress & WooCommerce Filters, published on 10 Oct 2026. 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

The Filter Everything — WordPress & WooCommerce Filters plugin for WordPress is vulnerable to Reflected Cross-Site Scripting in versions up to, and including, 1.9.6. This is due to insufficient input sanitization and output escaping in the flrt_elementor_load_more_anchor() function. The function reads query parameters from $_SERVER['REQUEST_URI'] via getFormActionOrFullPageUrl(true), which URL-decodes them through parse_str() and re-assembles them using build_query() — a WordPress core function that does NOT re-encode values ($urlencode=false). The resulting URL, containing unescaped special characters, is injected into a data-next-page HTML attribute via preg_replace() without esc_attr() or esc_url(). This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.

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

## Which versions are affected by CVE-2026-87869?


## How do I fix CVE-2026-87869?

No fix has been published for CVE-2026-87869 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-87869 being exploited?

There is no known exploitation of CVE-2026-87869 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-87869 and fix it if it is affected.

What it is: CVE-2026-87869 is a medium-severity cross-site scripting vulnerability in stepasyuk Filter Everything — WordPress & WooCommerce Filters, published on 10 Oct 2026. 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-2026-87869 in the wild and no public exploit code.

Affected product: stepasyuk Filter Everything — WordPress & WooCommerce Filters. 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-2026-87869/ (Markdown: https://insights.sbomify.com/CVE-2026-87869/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-87869
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-87869
- OSV: https://osv.dev/vulnerability/CVE-2026-87869

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-87869/
Summaries are generated and may contain mistakes; the official description above is the record.