# CVE-2021-24980: Gwolle Guestbook < 4.2.0 - Reflected Cross-Site Scripting

> Attackers can inject malicious scripts via the user email parameter in the Gwolle Guestbook WordPress plugin admin page, potentially compromising administrator accounts.

- **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:** 27 Dec 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-jh4v-x3g4-f2hj

## What is CVE-2021-24980?

CVE-2021-24980 is a medium-severity cross-site scripting vulnerability in Unknown Gwolle Guestbook, published on 27 Dec 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 Gwolle Guestbook WordPress plugin before 4.2.0 does not sanitise and escape the gwolle_gb_user_email parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting issue in an admin page

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

## Which versions are affected by CVE-2021-24980?

It affects 1 product.


Products: Gwolle Guestbook Project Gwolle Guestbook.

## How do I fix CVE-2021-24980?

No fix has been published for CVE-2021-24980 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24980 being exploited?

There is no known exploitation of CVE-2021-24980 in the wild and no public exploit code.

## Other vulnerabilities in Unknown Gwolle Guestbook

- [CVE-2015-8351](https://insights.sbomify.com/CVE-2015-8351/): Code injection in n/a (critical 9.0)
- [CVE-2018-17884](https://insights.sbomify.com/CVE-2018-17884/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2017-20089](https://insights.sbomify.com/CVE-2017-20089/): Gwolle Guestbook Plugin cross site scriting (low 3.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24980 and fix it if it is affected.

What it is: CVE-2021-24980 is a medium-severity cross-site scripting vulnerability in Unknown Gwolle Guestbook, published on 27 Dec 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-2021-24980 in the wild and no public exploit code.

Affected product: Unknown Gwolle Guestbook. 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-2021-24980/ (Markdown: https://insights.sbomify.com/CVE-2021-24980/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24980
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24980
- OSV: https://osv.dev/vulnerability/CVE-2021-24980

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24980/
Summaries are generated and may contain mistakes; the official description above is the record.