# CVE-2021-24586: Per Page Add to Head < 1.4.4 - CSRF to Stored XSS

> Attackers can exploit CSRF to inject malicious HTML into plugin settings, leading to Stored XSS that executes code in admin or user sessions.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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:** 13 Sep 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-gm56-4fv5-gp9q

## What is CVE-2021-24586?

CVE-2021-24586 is a medium-severity cross-site scripting vulnerability in Unknown Per page add to head, published on 13 Sep 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 Per page add to head WordPress plugin before 1.4.4 is lacking any CSRF check when saving its settings, which could allow attackers to make a logged in admin change them. Furthermore, as the plugin allows arbitrary HTML to be inserted in one of the setting (feature mentioned by the plugin), this could lead to Stored XSS issue which will be triggered either in the backend, frontend or both depending on the payload used.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2021-24586?

It affects 1 product.


Products: Evona per Page Add to Head.

## How do I fix CVE-2021-24586?

No fix has been published for CVE-2021-24586 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24586 being exploited?

There is no known exploitation of CVE-2021-24586 in the wild and no public exploit code.

## Other vulnerabilities in Unknown Per page add to head

- [CVE-2021-24619](https://insights.sbomify.com/CVE-2021-24619/): Per Page Add to Head <= 1.4.4 - Authenticated Stored XSS (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24586 and fix it if it is affected.

What it is: CVE-2021-24586 is a medium-severity cross-site scripting vulnerability in Unknown Per page add to head, published on 13 Sep 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: There is no known exploitation of CVE-2021-24586 in the wild and no public exploit code.

Affected product: Unknown Per page add to head. 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-2021-24586/ (Markdown: https://insights.sbomify.com/CVE-2021-24586/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24586
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24586
- OSV: https://osv.dev/vulnerability/CVE-2021-24586

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24586/
Summaries are generated and may contain mistakes; the official description above is the record.