CVE-2026-44392

Summary

CVE	CVE-2026-44392
State	PUBLISHED
Assigner	jpcert
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-05-20 07:16:15 UTC
Updated	2026-05-20 14:25:17 UTC
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.

Risk And Classification

Primary CVSS: v4.0 5.3 MEDIUM from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.000300000 probability, percentile 0.090470000 (date 2026-05-27)

Problem Types: CWE-862 | CWE-862 Missing authorization

Version	Source	Type	Score	Severity	Vector
4.0	[email protected]	Secondary	5.3	MEDIUM	`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/C...`
4.0	CNA	CVSS	5.3	MEDIUM	`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N`
3.0	[email protected]	Secondary	4.3	MEDIUM	`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N`
3.0	CNA	CVSS	4.3	MEDIUM	`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N`

CVSS v4.0 Breakdown

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

Low

User Interaction

None

Confidentiality

None

Integrity

Low

Availability

None

Sub Conf.

None

Sub Integrity

None

Sub Availability

None

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.0 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Six Apart Ltd.	Movable Type	affected 9.1.1 and earlier	Not specified
CNA	Six Apart Ltd.	Movable Type	affected 9.0.7 and earlier	Not specified
CNA	Six Apart Ltd.	Movable Type	affected 8.8.3 and earlier	Not specified
CNA	Six Apart Ltd.	Movable Type	affected 8.0.10 and earlier	Not specified
CNA	Six Apart Ltd.	Movable Type Advanced	affected 9.1.1 and earlie	Not specified
CNA	Six Apart Ltd.	Movable Type Advanced	affected 9.0.7 and earlier	Not specified
CNA	Six Apart Ltd.	Movable Type Advanced	affected 8.8.3 and earlier	Not specified
CNA	Six Apart Ltd.	Movable Type Advanced	affected 8.0.10 and earlier	Not specified
CNA	Six Apart Ltd.	Movable Type Premium	affected 9.1.1 and earlier	Not specified
CNA	Six Apart Ltd.	Movable Type Premium	affected 9.0.7 and earlier	Not specified
CNA	Six Apart Ltd.	Movable Type Premium	affected 2.15 and earlier (included in Movable Type 8.8.4 and earlier or Movable Type 8.0.11 and earlier)	Not specified
CNA	Six Apart Ltd.	Movable Type Premium Advanced Edition	affected 9.1.1 and earlier	Not specified
CNA	Six Apart Ltd.	Movable Type Premium Advanced Edition	affected 9.0.7 and earlier	Not specified
CNA	Six Apart Ltd.	Movable Type Premium Advanced Edition	affected 2.15 and earlier (included in Movable Type 8.8.4 and earlier or Movable Type 8.0.11 and earlier)	Not specified

References

Reference	Source	Link	Tags
jvn.jp/en/jp/JVN66473735	[email protected]	jvn.jp
movabletype.org/news/2026/05/mt-908-released.html	[email protected]	movabletype.org
www.sixapart.jp/movabletype/news/2026/05/20-1100.html	[email protected]	www.sixapart.jp
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

There are currently no legacy QID mappings associated with this CVE.