# CVE-2021-25083: Registrations for the Events Calendar < 2.7.10 - Reflected Cross-Site Scripting

> Attackers can execute arbitrary scripts in the context of other users via the qtype parameter in the settings page.

- **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:** 24 Jan 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-57q9-jqvx-2qj7

## What is CVE-2021-25083?

CVE-2021-25083 is a medium-severity cross-site scripting vulnerability in Unknown Registrations for the Events Calendar – Event Registration Plugin, published on 24 Jan 2022. 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 Registrations for the Events Calendar WordPress plugin before 2.7.10 does not escape the qtype parameter before outputting it back in an attribute in the settings page, leading to a Reflected Cross-Site Scripting

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

## Which versions are affected by CVE-2021-25083?

It affects 1 product.


Products: Roundupwp Registrations for the Events Calendar.

## How do I fix CVE-2021-25083?

No fix has been published for CVE-2021-25083 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-25083 being exploited?

There is no known exploitation of CVE-2021-25083 in the wild and no public exploit code.

## Other vulnerabilities in Unknown Registrations for the Events Calendar – Event Registration Plugin

- [CVE-2021-24943](https://insights.sbomify.com/CVE-2021-24943/): Registrations for the Events Calendar < 2.7.6 - Unauthenticated SQL Injection (critical 9.8)
- [CVE-2024-7982](https://insights.sbomify.com/CVE-2024-7982/): Registrations for The Events Calendar < 2.12.4 - Unauthenticated Stored XSS (critical 9.6)
- [CVE-2024-39638](https://insights.sbomify.com/CVE-2024-39638/): WordPress Registrations for the Events Calendar plugin <= 2.12.2 - SQL Injection vulnerability (high 8.5)
- [CVE-2024-10703](https://insights.sbomify.com/CVE-2024-10703/): Registrations for The Events Calendar < 2.13.4 - Admin+ Stored XSS (medium 6.1)
- [CVE-2021-24876](https://insights.sbomify.com/CVE-2021-24876/): Registrations for The Events Calendar < 2.7.5 - Reflected Cross-Site Scripting (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-25083 and fix it if it is affected.

What it is: CVE-2021-25083 is a medium-severity cross-site scripting vulnerability in Unknown Registrations for the Events Calendar – Event Registration Plugin, published on 24 Jan 2022. 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-2021-25083 in the wild and no public exploit code.

Affected product: Unknown Registrations for the Events Calendar – Event Registration Plugin. 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-2021-25083/ (Markdown: https://insights.sbomify.com/CVE-2021-25083/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-25083
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-25083
- OSV: https://osv.dev/vulnerability/CVE-2021-25083

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-25083/
Summaries are generated and may contain mistakes; the official description above is the record.