# CVE-2023-6645: Post Grid Combo – 36+ Gutenberg Blocks <= 2.2.64 - Authenticated (Contributor+) Cross-Site Scripting

> Authenticated contributors can inject arbitrary scripts via a custom JS parameter, leading to stored XSS execution for other users.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Jan 2024
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-3c6g-c26j-3686

## What is CVE-2023-6645?

CVE-2023-6645 is a medium-severity cross-site scripting vulnerability in pickplugins Post Grid, published on 11 Jan 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Post Grid Combo – 36+ Gutenberg Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the custom JS parameter in all versions up to, and including, 2.2.64 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor access or higher to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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

## Which versions are affected by CVE-2023-6645?

It affects 1 product.


Products: Pickplugins Post Grid Combo.

## How do I fix CVE-2023-6645?

No fix has been published for CVE-2023-6645 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-6645 being exploited?

There is no known exploitation of CVE-2023-6645 in the wild and no public exploit code.

## Other vulnerabilities in pickplugins Post Grid

- [CVE-2023-7072](https://insights.sbomify.com/CVE-2023-7072/): Post Grid Combo – 36+ Gutenberg Blocks <= 2.2.68 - Information Exposure via get_posts API Endpoint (high 7.5)
- [CVE-2023-40211](https://insights.sbomify.com/CVE-2023-40211/): WordPress Post Grid Plugin <= 2.2.50 is vulnerable to Sensitive Data Exposure (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-6645 and fix it if it is affected.

What it is: CVE-2023-6645 is a medium-severity cross-site scripting vulnerability in pickplugins Post Grid, published on 11 Jan 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-6645 in the wild and no public exploit code.

Affected product: pickplugins Post Grid. 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-2023-6645/ (Markdown: https://insights.sbomify.com/CVE-2023-6645/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-6645
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-6645
- OSV: https://osv.dev/vulnerability/CVE-2023-6645

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-6645/
Summaries are generated and may contain mistakes; the official description above is the record.