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CVE-2026-44392

MEDIUM
5.3
CVSS Score
Published: May 20, 2026 at 05:28 AM UTC
Updated: July 24, 2026 at 10:23 AM UTC
2 products affected across 1 vendorMovable TypeMovable Type Premium Advanced

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Movable Type· Sixapart
60%
v ≤ 2.15v ≤ 8.0.10v ≤ 8.8.3v ≤ 9.0.7v ≤ 9.1.19.1.1 and earlie
Movable Type Premium Advanced· Sixapart
60%
v ≤ 2.15v ≤ 9.0.7v ≤ 9.1.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

Source: cverecord
https://movabletype.org/news/2026/05/mt-908-released.html
Source: cverecord
https://www.sixapart.jp/movabletype/news/2026/05/20-1100.html
Source: cverecord
https://jvn.jp/en/jp/JVN66473735/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMjpcert
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-862

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