Backdrop CMS 1.33 End of Life Date
Backdrop CMS 1.33 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
Backdrop CMS 1.33 was released on January 16, 2026 and has no published end-of-life date yet. Its most recent patch is 1.33.3, published May 16, 2026.
What does Backdrop CMS 1.33 end of life mean?
When Backdrop CMS 1.33 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 Backdrop CMS 1.33 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Backdrop CMS 1.34 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.