# CVE-2021-24979: Paid Memberships Pro < 2.6.6 - Reflected Cross-Site Scripting

> An attacker can execute arbitrary scripts in the admin interface via the s parameter, 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-33mq-pfqq-c55m

## What is CVE-2021-24979?

CVE-2021-24979 is a medium-severity cross-site scripting vulnerability in Unknown Paid Memberships Pro, 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 Paid Memberships Pro WordPress plugin before 2.6.6 does not escape the s parameter before outputting it back in an attribute in an admin 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-2021-24979?

It affects 1 product.


Products: Strangerstudios Paid Memberships Pro.

## How do I fix CVE-2021-24979?

No fix has been published for CVE-2021-24979 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24979 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24979 exists.

Public exploit code:

- Paid Memberships Pro < 2.6.6 - Cross-Site Scripting (nuclei): http/cves/2021/CVE-2021-24979.yaml

## Other vulnerabilities in Unknown Paid Memberships Pro

- [CVE-2023-23488](https://insights.sbomify.com/CVE-2023-23488/): SQL injection in Paid Memberships Pro WordPress Plugin (critical 9.8)
- [CVE-2021-25114](https://insights.sbomify.com/CVE-2021-25114/): Paid Memberships Pro < 2.6.7 - Unauthenticated Blind SQL Injection (critical 9.8)
- [CVE-2023-0631](https://insights.sbomify.com/CVE-2023-0631/): Paid Memberships Pro < 2.9.12 - Subscriber+ SQL Injection (high 8.8)
- [CVE-2021-20678](https://insights.sbomify.com/CVE-2021-20678/): SQL injection in Paid Memberships Pro (high 8.8)
- [CVE-2024-37486](https://insights.sbomify.com/CVE-2024-37486/): WordPress Paid Memberships Pro plugin <= 3.0.5 - Authenticated SQL Injection vulnerability (high 7.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24979 and fix it if it is affected.

What it is: CVE-2021-24979 is a medium-severity cross-site scripting vulnerability in Unknown Paid Memberships Pro, 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24979 exists.

Affected product: Unknown Paid Memberships Pro. 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-2021-24979/ (Markdown: https://insights.sbomify.com/CVE-2021-24979/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24979
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24979
- OSV: https://osv.dev/vulnerability/CVE-2021-24979

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24979/
Summaries are generated and may contain mistakes; the official description above is the record.