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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.

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

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

References

CVE-2017-20257 questions

Which versions are affected by CVE-2017-20257?
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 is a single fixed fee per incident, usually resolved the same day.

This check is part of the mySites.guru Joomla vulnerability scanner, which reads every installed extension's version on each audit. Browse the rest of the Joomla vulnerability database.

Rules current as of 25 October 2026.