Auth bypass in Six Apart Ltd. Movable Type
CVE-2026-44392
Missing authorization vulnerability exists in Movable Type. Under certain conditions, when a user without administrator privileges signs in to the product, unintended update processing may be executed.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (23.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Six Apart Ltd. Movable Type — versions 9.1.1 and earlier, 9.0.7 and earlier, 8.8.3 and earlier
- Six Apart Ltd. Movable Type Advanced — versions 9.1.1 and earlie, 9.0.7 and earlier, 8.8.3 and earlier
- Six Apart Ltd. Movable Type Premium — versions 9.1.1 and earlier, 9.0.7 and earlier, 2.15 and earlier (included in Movable Type 8.8.4 and earlier or Movable Type 8.0.11 and earlier)
- Six Apart Ltd. Movable Type Premium (Advanced Edition) — versions 9.1.1 and earlier, 9.0.7 and earlier, 2.15 and earlier (included in Movable Type 8.8.4 and earlier or Movable Type 8.0.11 and earlier)
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-44392?
- CVE-2026-44392 is a medium-severity vulnerability in Six Apart Ltd. Movable Type, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-05-20.
- How severe is CVE-2026-44392?
- Medium severity. CVSS v3 base score is 4.3 out of 10.