Vulnerability · Published May 20, 2026 · Assigned by jpcert
CVE-2026-44392
Medium 4.3
In plain English
A medium-severity missing authorization in Movable Type from Six Apart Ltd.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).
Severity (CVSS 3.0)4.3Medium
Exploit odds (30 days)0.2%top 83.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Six Apart Ltd. | Movable Type | 9.1.1 and earlier |
| Six Apart Ltd. | Movable Type | 9.0.7 and earlier |
| Six Apart Ltd. | Movable Type | 8.8.3 and earlier |
| Six Apart Ltd. | Movable Type | 8.0.10 and earlier |
| Six Apart Ltd. | Movable Type Advanced | 9.1.1 and earlie |
| Six Apart Ltd. | Movable Type Advanced | 9.0.7 and earlier |
| Six Apart Ltd. | Movable Type Advanced | 8.8.3 and earlier |
| Six Apart Ltd. | Movable Type Advanced | 8.0.10 and earlier |
| Six Apart Ltd. | Movable Type Premium | 9.1.1 and earlier |
| Six Apart Ltd. | Movable Type Premium | 9.0.7 and earlier |
| Six Apart Ltd. | Movable Type Premium | 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) | 9.1.1 and earlier |
| Six Apart Ltd. | Movable Type Premium (Advanced Edition) | 9.0.7 and earlier |
| Six Apart Ltd. | Movable Type Premium (Advanced Edition) | 2.15 and earlier (included in Movable Type 8.8.4 and earlier or Movable Type 8.0.11 and earlier) |
Weakness: CWE-862 · Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N