Concrete CMS 5.6 · Version Status
Concrete CMS 5.6 End of Life Date
Concrete CMS 5.6 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
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Concrete CMS 5.6 is past end of life. This version no longer receives security patches. 2730 days past EOL — migrate to a supported version immediately.
EOL Date
Feb 26, 2019
2730 days past EOL
Latest Release
5.6.4.0
Standard release
Release Date
Aug 26, 2012
Concrete CMS 5.6 series
Lifecycle detail
Concrete CMS 5.6 was released on August 26, 2012 and support ended on February 26, 2019 — a supported lifespan of 6 years and 6 months, in line with the 6 years and 6 months median for Concrete CMS releases. The last patch it will ever receive is 5.6.4.0, published February 26, 2019 — on the day support ended. It has been without security patches for 7 years and 6 months. 1 newer Concrete CMS release has shipped since.
Attack Surface
10/30 Medium tier
CISA KEV Exposure
0/20 Not in KEV
Extended Support
0/10 Available
EOL Risk Score™ — proprietary methodology by endoflife.ai. Factors: EOL recency, attack surface breadth, CISA KEV catalog presence, extended support availability. Updated at every build.
Methodology → ·
View score card →
Extended Support
Extended Concrete CMS 5.6 support is available
Commercial vendors offer security patches beyond EOL. Compare your options.
Compare Options →
All Concrete CMS Versions
| Version | Latest | EOL Date | Status |
|---|
| → 5.6 |
5.6.4.0 |
Feb 26, 2019 |
EOL |
| 5.7 |
5.7.5.13 |
Oct 23, 2019 |
EOL |
| 8 |
8.5.21 |
Aug 5, 2025 |
EOL |
| 9 |
9.5.2 |
EOL |
Active |
What does Concrete CMS 5.6 end of life mean?
When Concrete CMS 5.6 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Running Concrete CMS 5.6 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Concrete CMS 9 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Concrete CMS 5.6 reach end of life?
Concrete CMS 5.6 reached end of life on February 26, 2019. This version is no longer receiving security patches.
Is Concrete CMS 5.6 still supported?
No. Concrete CMS 5.6 reached end of life on February 26, 2019 and is no longer receiving security patches.
What should I upgrade to from Concrete CMS 5.6?
The recommended upgrade from Concrete CMS 5.6 is
Concrete CMS 9 — the latest actively supported version. Check the
Concrete CMS full timeline for all supported versions.
What are the security risks of running Concrete CMS 5.6 past EOL?
When Concrete CMS 5.6 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no remediation path. Most vulnerability scanners do not flag this — it is the CVE blind spot. Organizations running EOL Concrete CMS should migrate immediately or implement compensating controls.