# Joomla Quiz Deluxe (com_joomlaquiz) <= 3.7.4 - Unauthenticated SQL Injection

[Joomla Vulnerability Database](https://mysites.guru/vulnerabilities/)/CVE-2017-20257

CVE-2017-20257HighCVSS 8.8CVE published 19 June 2026

# Joomla Quiz Deluxe (com\_joomlaquiz) <= 3.7.4 - Unauthenticated SQL Injection

Joomla Quiz Deluxe 3.7.4 and earlier expose the ajaxaction.flag\_question task, which builds a SQL statement from unescaped request input. An unauthenticated attacker can execute arbitrary SQL and read the whole Joomla database, including the user table and its password hashes. No fix was published for this branch. Update to a current Joomla Quiz Deluxe release, or uninstall the component if it is no longer used.

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## Is my site affected?

- **Affected** - Joomla Quiz Deluxe up to and including 3.7.4
- **Fixed in** - A release after 3.7.4
- **What to do** - Update Joomla Quiz Deluxe to the newest release from the vendor. This flaw covers versions up to 3.7.4, so any later release is outside it.

[Check whether your sites are affected](https://mysites.guru/free-audit/)

## How CVE-2017-20257 is scored

The base metrics as VulnCheck CNA published them, and what each one means for a site running an affected version. Threat and environmental metrics are left out: they describe a moment or a particular install rather than the flaw.

8.8 High

CVSS 4.0, scored by VulnCheck CNA

`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N`

### How it is reached

- **AV:N Attack vector** - Network. Reachable across the internet
- **AC:L Attack complexity** - Low. Nothing to work around, it just works
- **AT:N Attack requirements** - None. Works against any affected install
- **PR:N Privileges required** - None. No account needed
- **UI:N User interaction** - None. Nobody has to be tricked into anything

### What it does to the site

- **VC:H Confidentiality** - High. Everything the site holds can be read
- **VI:L Integrity** - Low. Some data can be altered
- **VA:N Availability** - None. The site stays up

### What it does beyond the site

- **SC:N Confidentiality** - None. Other systems keep their data
- **SI:N Integrity** - None. Other systems keep their integrity
- **SA:N Availability** - None. Other systems stay up

## Timeline

1.  19 June 2026CVE-2017-20257 record published by its CNA

## Rule details

[CVE-2017-20257](https://mysites.guru/vulnerabilities/CVE-2017-20257/)

Joomla Quiz Deluxe

Affected versions: ≤ 3.7.4

Full advisory: [nvd.nist.gov](https://nvd.nist.gov/vuln/detail/CVE-2017-20257)

## References

-   [CVE-2017-20257 on cve.org (the official CVE record)](https://www.cve.org/CVERecord?id=CVE-2017-20257)
-   [CVE-2017-20257 in the NIST National Vulnerability Database](https://nvd.nist.gov/vuln/detail/CVE-2017-20257)

## CVE-2017-20257 questions

Show all

Which versions are affected by CVE-2017-20257?

[CVE-2017-20257](https://mysites.guru/vulnerabilities/CVE-2017-20257/) affects Joomla Quiz Deluxe up to and including 3.7.4.

How do I fix CVE-2017-20257?

Update Joomla Quiz Deluxe to the newest release from the vendor. This flaw covers versions up to 3.7.4, so any later release is outside it.

How severe is CVE-2017-20257?

VulnCheck CNA scores it 8.8 (High) under CVSS 4.0. In plain terms: reachable across the internet, no account needed and nobody has to be tricked into anything.

## Running an affected version on a site you manage?

A free audit tells you which of your Joomla and WordPress sites run an affected version, which are out of date, and which have not been backed up. No card required. If a site is already compromised, [fix.mysites.guru](https://fix.mysites.guru/) is a single fixed fee per incident, usually resolved the same day.

This check is part of the [mySites.guru Joomla vulnerability scanner](https://mysites.guru/joomla-vulnerability-scanner/), which reads every installed extension's version on each audit. Browse the rest of the [Joomla vulnerability database](https://mysites.guru/vulnerabilities/).

Rules current as of 14 October 2026.