# CVE-2026-57658: WordPress TemplateSpare plugin <= 4.2.0 - Arbitrary File Upload vulnerability

> Administrators can upload arbitrary files in the TemplateSpare WordPress plugin, potentially leading to remote code execution.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Jun 2026
- **Updated:** 26 Jun 2026
- **Also known as:** GHSA-98gc-mw7m-prrh

## What is CVE-2026-57658?

CVE-2026-57658 is a critical vulnerability in TemplateSpare, published on 26 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Administrator Arbitrary File Upload in TemplateSpare <= 4.2.0 versions.

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

## Which versions are affected by CVE-2026-57658?


## How do I fix CVE-2026-57658?

No fix has been published for CVE-2026-57658 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-57658 being exploited?

There is no known exploitation of CVE-2026-57658 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-57658 and fix it if it is affected.

What it is: CVE-2026-57658 is a critical vulnerability in TemplateSpare, published on 26 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-57658 in the wild and no public exploit code.

Affected product: TemplateSpare. 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-2026-57658/ (Markdown: https://insights.sbomify.com/CVE-2026-57658/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-57658
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-57658
- OSV: https://osv.dev/vulnerability/CVE-2026-57658

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-57658/
Summaries are generated and may contain mistakes; the official description above is the record.