# CVE-2021-24418: Smooth Scroll Page Up/Down Buttons <= 1.4 - Authenticated Stored XSS via psb_positioning

> Authenticated admins can inject stored XSS payloads via plugin settings, executing scripts on all blog pages.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 12 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-hv4v-qq65-xmfx

## What is CVE-2021-24418?

CVE-2021-24418 is a medium-severity cross-site scripting vulnerability in Mark Senff Smooth Scroll Page Up/Down Buttons, published on 12 Jul 2021. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

The Smooth Scroll Page Up/Down Buttons WordPress plugin through 1.4 does not properly sanitise and validate its psb_positioning settings, allowing high privilege users such as admin to set an XSS payload in it, which will be executed in all pages of the blog

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

## Which versions are affected by CVE-2021-24418?

It affects 1 product.


Products: Smooth Scroll Page Up\/Down Buttons Project Smooth Scroll Page Up\/Down Buttons.

## How do I fix CVE-2021-24418?

No fix has been published for CVE-2021-24418 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24418 being exploited?

There is no known exploitation of CVE-2021-24418 in the wild and no public exploit code.

## Other vulnerabilities in Mark Senff Smooth Scroll Page Up/Down Buttons

- [CVE-2021-24331](https://insights.sbomify.com/CVE-2021-24331/): Smooth Scroll Page Up/Down Buttons < 1.4 - Authenticated Stored XSS (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24418 and fix it if it is affected.

What it is: CVE-2021-24418 is a medium-severity cross-site scripting vulnerability in Mark Senff Smooth Scroll Page Up/Down Buttons, published on 12 Jul 2021. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-24418 in the wild and no public exploit code.

Affected product: Mark Senff Smooth Scroll Page Up/Down Buttons. 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-2021-24418/ (Markdown: https://insights.sbomify.com/CVE-2021-24418/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24418
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24418
- OSV: https://osv.dev/vulnerability/CVE-2021-24418

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24418/
Summaries are generated and may contain mistakes; the official description above is the record.