# CVE-2026-12089: WS Optimize – All-in-One Speed Booster & Cache Tools <= 3.3.19 - Authenticated (Editor+) Arbitrary File Read

> Authenticated editors can read arbitrary files on the server due to insufficient path validation in the CSS combination function.

- **Severity:** Medium 4.9 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Jun 2026
- **Updated:** 15 Jun 2026
- **Also known as:** GHSA-cx9x-fm2c-c65m

## What is CVE-2026-12089?

CVE-2026-12089 is a medium-severity path traversal vulnerability in aurelienlws LWS Optimize – All-in-One Speed Booster & Cache Tools, published on 13 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

The LWS Optimize – All-in-One Speed Booster & Cache Tools plugin for WordPress is vulnerable to Arbitrary File Read in versions up to, and including, 3.3.19. This is due to the combine_current_css() function  trusting <link rel="stylesheet" href="..."> values harvested from page HTML and converting same-site URLs to absolute filesystem paths before reading them with file_get_contents()/Minify\CSS::add(), without enforcing that the resolved path stay within ABSPATH or have a .css extension. This makes it possible for authenticated attackers, with Editor-level access and above, to read arbitrary files.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-12089?


## How do I fix CVE-2026-12089?

No fix has been published for CVE-2026-12089 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12089 being exploited?

There is no known exploitation of CVE-2026-12089 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12089 and fix it if it is affected.

What it is: CVE-2026-12089 is a medium-severity path traversal vulnerability in aurelienlws LWS Optimize – All-in-One Speed Booster & Cache Tools, published on 13 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-12089 in the wild and no public exploit code.

Affected product: aurelienlws LWS Optimize – All-in-One Speed Booster & Cache Tools. 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-2026-12089/ (Markdown: https://insights.sbomify.com/CVE-2026-12089/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12089
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12089
- OSV: https://osv.dev/vulnerability/CVE-2026-12089

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-12089/
Summaries are generated and may contain mistakes; the official description above is the record.