# CVE-2021-24488: Post Grid < 2.1.8 - Reflected Cross-Site Scripting (XSS)

> Reflected XSS in Post Grid plugin allows attackers to execute arbitrary scripts via unsanitized slider import search and tab parameters.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/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:** 2 Aug 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-grvg-w4gv-9v46

## What is CVE-2021-24488?

CVE-2021-24488 is a medium-severity cross-site scripting vulnerability in Unknown Post Grid, published on 2 Aug 2021. 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 slider import search feature and tab parameter of the Post Grid WordPress plugin before 2.1.8 settings are not properly sanitised before being output back in the pages, leading to Reflected Cross-Site Scripting issues

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

## Which versions are affected by CVE-2021-24488?

It affects 1 product.


Products: Pickplugins Post Grid.

## How do I fix CVE-2021-24488?

No fix has been published for CVE-2021-24488 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24488 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24488 exists.

Public exploit code:

- WordPress Plugin Post Grid 2.1.1 - Cross Site Scripting (XSS) (exploitdb)
- WordPress Post Grid <2.1.8 - Cross-Site Scripting (nuclei): http/cves/2021/CVE-2021-24488.yaml

## Other vulnerabilities in Unknown Post Grid

- [CVE-2021-4450](https://insights.sbomify.com/CVE-2021-4450/): Post Grid <= 2.1.12 - Contributor+ SQL Injection (high 8.8)
- [CVE-2024-8253](https://insights.sbomify.com/CVE-2024-8253/): Post Grid and Gutenberg Blocks 2.2.87 - 2.2.90 - Authenticated (Subscriber+) Privilege Escalation (high 8.8)
- [CVE-2024-13408](https://insights.sbomify.com/CVE-2024-13408/): Path traversal in Post Grid, Slider & Carousel Ultimate – with Shortcode, Gutenberg Block & Elementor Widget (high 7.5)
- [CVE-2020-35936](https://insights.sbomify.com/CVE-2020-35936/): Cross-site scripting in n/a (high 7.5)
- [CVE-2020-35937](https://insights.sbomify.com/CVE-2020-35937/): Cross-site scripting in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24488 and fix it if it is affected.

What it is: CVE-2021-24488 is a medium-severity cross-site scripting vulnerability in Unknown Post Grid, published on 2 Aug 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24488 exists.

Affected product: Unknown 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-2021-24488/ (Markdown: https://insights.sbomify.com/CVE-2021-24488/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24488
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24488
- OSV: https://osv.dev/vulnerability/CVE-2021-24488

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24488/
Summaries are generated and may contain mistakes; the official description above is the record.