# CVE-2021-24131: Anti-Spam by CleanTalk < 5.149 - Multiple Authenticated SQL Injections

> Authenticated administrators can exploit unvalidated input to perform SQL injection attacks, potentially reading or modifying database contents.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Mar 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-hv83-f95q-qg45

## What is CVE-2021-24131?

CVE-2021-24131 is a high-severity SQL injection vulnerability in Unknown Anti-Spam by CleanTalk, published on 18 Mar 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Unvalidated input in the Anti-Spam by CleanTalk WordPress plugin, versions before 5.149, lead to multiple authenticated SQL injection vulnerabilities, however, it requires high privilege user (admin+).

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command)

## Which versions are affected by CVE-2021-24131?

It affects 1 product.


Products: Cleantalk Anti-Spam.

## How do I fix CVE-2021-24131?

No fix has been published for CVE-2021-24131 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24131 being exploited?

There is no known exploitation of CVE-2021-24131 in the wild and no public exploit code.

## Other vulnerabilities in Unknown Anti-Spam by CleanTalk

- [CVE-2024-10542](https://insights.sbomify.com/CVE-2024-10542/): Auth bypass in Spam protection, Honeypot, Anti-Spam by CleanTalk (critical 9.8)
- [CVE-2026-10770](https://insights.sbomify.com/CVE-2026-10770/): Anti-Spam by CleanTalk - Moderately critical - Cross site scripting - SA-CONTRIB-2026-042 (medium 6.1)
- [CVE-2026-3213](https://insights.sbomify.com/CVE-2026-3213/): Anti-Spam by CleanTalk - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-014 (medium 4.7)
- [CVE-2023-51696](https://insights.sbomify.com/CVE-2023-51696/): Cross-site request forgery in Spam protection, Anti-Spam, FireWall by CleanTalk (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24131 and fix it if it is affected.

What it is: CVE-2021-24131 is a high-severity SQL injection vulnerability in Unknown Anti-Spam by CleanTalk, published on 18 Mar 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-24131 in the wild and no public exploit code.

Affected product: Unknown Anti-Spam by CleanTalk. 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-2021-24131/ (Markdown: https://insights.sbomify.com/CVE-2021-24131/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24131
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24131
- OSV: https://osv.dev/vulnerability/CVE-2021-24131

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24131/
Summaries are generated and may contain mistakes; the official description above is the record.