# CVE-2026-14287: TenWeb Speed Optimizer < 2.33.5 - Unauthenticated Stored XSS via Critical CSS Token Bypass

> Unauthenticated attackers can inject malicious JavaScript into pages via stored XSS in the 10Web Booster plugin, affecting all visitors.

- **Severity:** Medium 4.7 (`CVSS:3.1/AV:N/AC:H/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:** 19 Aug 2026
- **Updated:** 19 Aug 2026
- **Also known as:** GHSA-8qr6-f92h-v629

## What is CVE-2026-14287?

CVE-2026-14287 is a medium-severity cross-site scripting vulnerability in Unknown 10Web Booster, published on 19 Aug 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 10Web Booster  WordPress plugin before 2.33.5 does not correctly validate an access token on an unauthenticated request handler and does not escape attacker-supplied stylesheet content before rendering it into the page head, allowing an unauthenticated attacker to store markup that executes as JavaScript in the browser of anonymous visitors to an affected page.

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

## Which versions are affected by CVE-2026-14287?


## How do I fix CVE-2026-14287?

No fix has been published for CVE-2026-14287 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-14287 being exploited?

There is no known exploitation of CVE-2026-14287 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-14287 and fix it if it is affected.

What it is: CVE-2026-14287 is a medium-severity cross-site scripting vulnerability in Unknown 10Web Booster, published on 19 Aug 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-2026-14287 in the wild and no public exploit code.

Affected product: Unknown 10Web Booster. 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-2026-14287/ (Markdown: https://insights.sbomify.com/CVE-2026-14287/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-14287
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-14287
- OSV: https://osv.dev/vulnerability/CVE-2026-14287

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-14287/
Summaries are generated and may contain mistakes; the official description above is the record.