# CVE-2021-24306: Ultimate Member < 2.1.20 - Authenticated Reflected Cross-Site Scripting (XSS)

> Authenticated attackers can execute arbitrary scripts in victim browsers via a malicious link in the Ultimate Member WordPress plugin.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 24 May 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-8cvw-43cv-8xmh

## What is CVE-2021-24306?

CVE-2021-24306 is a medium-severity cross-site scripting vulnerability in Ultimate Member – User Profile, User Registration, Login & Membership Plugin, published on 24 May 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

The Ultimate Member – User Profile, User Registration, Login & Membership Plugin WordPress plugin before 2.1.20 did not properly sanitise, validate or encode the query string when generating a link to edit user's own profile, leading to an authenticated reflected Cross-Site Scripting issue. Knowledge of the targeted username is required to exploit this, and attackers would then need to make the related logged in user open a malicious link.

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

## Which versions are affected by CVE-2021-24306?

It affects 1 product.


Products: Ultimatemember Ultimate Member.

## How do I fix CVE-2021-24306?

No fix has been published for CVE-2021-24306 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24306 being exploited?

There is no known exploitation of CVE-2021-24306 in the wild and no public exploit code.

## Other vulnerabilities in Ultimate Member – User Profile, User Registration, Login & Membership Plugin

- [CVE-2020-36155](https://insights.sbomify.com/CVE-2020-36155/): Privilege escalation in n/a (critical 10.0)
- [CVE-2020-36157](https://insights.sbomify.com/CVE-2020-36157/): Privilege escalation in n/a (critical 10.0)
- [CVE-2020-36156](https://insights.sbomify.com/CVE-2020-36156/): Privilege escalation in n/a (critical 9.9)
- [CVE-2024-1071](https://insights.sbomify.com/CVE-2024-1071/): SQL injection in Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin (critical 9.8)
- [CVE-2023-3460](https://insights.sbomify.com/CVE-2023-3460/): Ultimate Member < 2.6.7 - Unauthenticated Privilege Escalation (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24306 and fix it if it is affected.

What it is: CVE-2021-24306 is a medium-severity cross-site scripting vulnerability in Ultimate Member – User Profile, User Registration, Login & Membership Plugin, published on 24 May 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-24306 in the wild and no public exploit code.

Affected product: Ultimate Member – User Profile, User Registration, Login & Membership 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-2021-24306/ (Markdown: https://insights.sbomify.com/CVE-2021-24306/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24306
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24306
- OSV: https://osv.dev/vulnerability/CVE-2021-24306

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-24306/
Summaries are generated and may contain mistakes; the official description above is the record.