# CVE-2026-108587: 10Web Booster <= 2.34.10 - Unauthenticated Arbitrary File Upload via 'page_id' Parameter

> Unauthenticated attackers can upload executable files via the page_id parameter if a specific nonce is leaked, leading to remote code execution.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Oct 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-38rr-wcwh-jgw6

## What is CVE-2026-108587?

CVE-2026-108587 is a critical vulnerability in 10Web Booster – Website speed optimization, Cache & Page Speed optimizer, published on 15 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The 10Web Booster – Website speed optimization, Cache & Page Speed optimizer plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.34.10 via the compressCustom function. This is due to missing file type validation and extension filtering on the page_id parameter, combined with a world-readable leaked nonce that bypasses authentication checks. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. This exploit chain requires obtaining the plugin's REST nonce (tenwebio_rest), which is automatically serialized to a world-readable file under wp-content/uploads/ whenever a bulk optimisation batch pauses; because the nonce is generated in a cron/loopback context with a user ID of 0, it is valid for unauthenticated visitors.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2026-108587?


## How do I fix CVE-2026-108587?

No fix has been published for CVE-2026-108587 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-108587 being exploited?

There is no known exploitation of CVE-2026-108587 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-108587 and fix it if it is affected.

What it is: CVE-2026-108587 is a critical vulnerability in 10Web Booster – Website speed optimization, Cache & Page Speed optimizer, published on 15 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-108587 in the wild and no public exploit code.

Affected product: 10Web Booster – Website speed optimization, Cache & Page Speed optimizer. 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-2026-108587/ (Markdown: https://insights.sbomify.com/CVE-2026-108587/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-108587
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-108587
- OSV: https://osv.dev/vulnerability/CVE-2026-108587

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-108587/
Summaries are generated and may contain mistakes; the official description above is the record.