# CVE-2021-24870: WP Fastest Cache < 0.9.5 - CSRF to Stored Cross-Site Scripting

> Attackers can inject malicious scripts via CSRF in WP Fastest Cache, potentially compromising high-privilege user 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:** 16 Jan 2024
- **Updated:** 9 Jan 2026
- **Also known as:** GHSA-mvrw-4465-r2jc

## What is CVE-2021-24870?

CVE-2021-24870 is a medium-severity cross-site scripting vulnerability in Unknown WP Fastest Cache, published on 16 Jan 2024. 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 WP Fastest Cache WordPress plugin before 0.9.5 is lacking a CSRF check in its wpfc_save_cdn_integration AJAX action, and does not sanitise and escape some the options available via the action, which could allow attackers to make logged in high privilege users call it and set a Cross-Site Scripting payload

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2021-24870?

It affects 1 product.


Products: Wpfastestcache Wp Fastest Cache.

## How do I fix CVE-2021-24870?

No fix has been published for CVE-2021-24870 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24870 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24870 exists.

## Other vulnerabilities in Unknown WP Fastest Cache

- [CVE-2015-9316](https://insights.sbomify.com/CVE-2015-9316/): SQL injection in n/a (critical 9.8)
- [CVE-2019-13635](https://insights.sbomify.com/CVE-2019-13635/): Path traversal in n/a (critical 9.1)
- [CVE-2021-24869](https://insights.sbomify.com/CVE-2021-24869/): WP Fastest Cache < 0.9.5 - Subscriber+ SQL Injection (high 8.8)
- [CVE-2023-1938](https://insights.sbomify.com/CVE-2023-1938/): WP Fatest Cache < 1.1.5 - Blind SSRF via CSRF (high 8.8)
- [CVE-2018-17584](https://insights.sbomify.com/CVE-2018-17584/): Cross-site request forgery in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24870 and fix it if it is affected.

What it is: CVE-2021-24870 is a medium-severity cross-site scripting vulnerability in Unknown WP Fastest Cache, published on 16 Jan 2024. 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-2021-24870 exists.

Affected product: Unknown WP Fastest Cache. 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-2021-24870/ (Markdown: https://insights.sbomify.com/CVE-2021-24870/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24870
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24870
- OSV: https://osv.dev/vulnerability/CVE-2021-24870

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24870/
Summaries are generated and may contain mistakes; the official description above is the record.