Public proof of conceptFix available

CVE-2016-8869

A public proof of concept exists; no exploitation attested.

Published2016-11-04
WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The register method in the UsersModelRegistration class in controllers/user.php in the Users component in Joomla! before 3.6.4 allows remote attackers to gain privileges by leveraging incorrect use of unfiltered data when registering on a site.

Timeline

dates in UTC

2016-11-0421:59CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-8869?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-8869?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Joomla

Branch	Affected	Fixed in	Source
3.6	≤ 3.6.3	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

developer.joomla.orgVendor Advisory
github.comPatch

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 3 repositories, unverifiedzugetor/Joomla-3.4.4-3.6.4_CVE-2016-8869_and_CVE-2016-8870rustyJ4ck/JoomlaCVE20168869cved-sources/cve-2016-8869

Sources

NVDCVSS 3.09.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
NVDweakness (CWE)CWE-20read 2026-10-23
FIRST EPSSEPSS score97.3 %read 2026-10-23
PoC-in-GitHubproof of concept3read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2016-11-04
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2016-8869?

Is CVE-2016-8869 actively exploited?

Active exploitation of CVE-2016-8869 has not been confirmed. Its EPSS score was 97.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-8869?

CVE-2016-8869 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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