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Vulnerability Details :

CVE-2026-23704

Summary
Assigner-jpcert
Assigner Org ID-ede6fdc4-6654-4307-a26d-3331c018e2ce
Published At-04 Feb, 2026 | 07:03
Updated At-04 Feb, 2026 | 16:07
Rejected At-
Credits

A non-administrative user can upload malicious files. When an administrator or the product accesses that file, an arbitrary script may be executed on the administrator's browser. Note that Movable Type 7 series and 8.4 series, which are End-of-Life (EOL), are affected by the vulnerability as well.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:jpcert
Assigner Org ID:ede6fdc4-6654-4307-a26d-3331c018e2ce
Published At:04 Feb, 2026 | 07:03
Updated At:04 Feb, 2026 | 16:07
Rejected At:
â–¼CVE Numbering Authority (CNA)

A non-administrative user can upload malicious files. When an administrator or the product accesses that file, an arbitrary script may be executed on the administrator's browser. Note that Movable Type 7 series and 8.4 series, which are End-of-Life (EOL), are affected by the vulnerability as well.

Affected Products
Vendor
Six Apart Ltd.
Product
Movable Type (Software Edition)
Versions
Affected
  • 9.0.4 to 9.0.5 (9.0 series)
  • 8.8.0 to 8.8.1 (8.8 series)
  • 8.0.2 to 8.0.8 (8.0 series)
Vendor
Six Apart Ltd.
Product
Movable Type Advanced (Software Edition)
Versions
Affected
  • 9.0.4 to 9.0.5 (9.0 series)
  • 8.8.0 to 8.8.1 (8.8 series)
  • 8.0.2 to 8.0.8 (8.0 series)
Vendor
Six Apart Ltd.
Product
Movable Type Premium (Software Edition)
Versions
Affected
  • 9.0.4 (MTP 9.0 series)
  • 2.13 and earlier (MTP 2 series)
Vendor
Six Apart Ltd.
Product
Movable Type Premium (Advanced Edition) (Software Edition)
Versions
Affected
  • 9.0.4 (MTP 9.0 series)
  • 2.13 and earlier (MTP 2 series)
Vendor
Six Apart Ltd.
Product
Movable Type (Cloud Edition)
Versions
Affected
  • 9.0.5 (9 series)
  • 8.8.1 (8 series)
Vendor
Six Apart Ltd.
Product
Movable Type Premium (Cloud Edition)
Versions
Affected
  • 9.0.5 (9 series)
  • 2.12 (MTP 2 series)
Problem Types
TypeCWE IDDescription
CWECWE-434Unrestricted upload of file with dangerous type
Type: CWE
CWE ID: CWE-434
Description: Unrestricted upload of file with dangerous type
Metrics
VersionBase scoreBase severityVector
3.06.5MEDIUM
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
4.05.1MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L
Version: 3.0
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Version: 4.0
Base score: 5.1
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://movabletype.org/news/2026/02/mt-906-released.html
N/A
https://www.sixapart.jp/movabletype/news/2026/02/04-1100.html
N/A
https://jvn.jp/en/jp/JVN45405689/
N/A
Hyperlink: https://movabletype.org/news/2026/02/mt-906-released.html
Resource: N/A
Hyperlink: https://www.sixapart.jp/movabletype/news/2026/02/04-1100.html
Resource: N/A
Hyperlink: https://jvn.jp/en/jp/JVN45405689/
Resource: N/A
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:vultures@jpcert.or.jp
Published At:04 Feb, 2026 | 07:16
Updated At:04 Feb, 2026 | 16:33

A non-administrative user can upload malicious files. When an administrator or the product accesses that file, an arbitrary script may be executed on the administrator's browser. Note that Movable Type 7 series and 8.4 series, which are End-of-Life (EOL), are affected by the vulnerability as well.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.05.1MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L/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
Secondary3.06.5MEDIUM
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Type: Secondary
Version: 4.0
Base score: 5.1
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L/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
Type: Secondary
Version: 3.0
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-434Primaryvultures@jpcert.or.jp
CWE ID: CWE-434
Type: Primary
Source: vultures@jpcert.or.jp
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://jvn.jp/en/jp/JVN45405689/vultures@jpcert.or.jp
N/A
https://movabletype.org/news/2026/02/mt-906-released.htmlvultures@jpcert.or.jp
N/A
https://www.sixapart.jp/movabletype/news/2026/02/04-1100.htmlvultures@jpcert.or.jp
N/A
Hyperlink: https://jvn.jp/en/jp/JVN45405689/
Source: vultures@jpcert.or.jp
Resource: N/A
Hyperlink: https://movabletype.org/news/2026/02/mt-906-released.html
Source: vultures@jpcert.or.jp
Resource: N/A
Hyperlink: https://www.sixapart.jp/movabletype/news/2026/02/04-1100.html
Source: vultures@jpcert.or.jp
Resource: N/A

Change History

0
Information is not available yet

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Matching Score-8
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CVSS Score-4.8||MEDIUM
EPSS-0.01% / 1.75%
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Published-04 Feb, 2026 | 07:04
Updated-04 Feb, 2026 | 16:33
Rejected-Not Available
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If a malformed data is input to the affected product, a CSV file downloaded from the affected product may contain such malformed data. When a victim user download and open such a CSV file, the embedded code may be executed in the user's environment. Note that Movable Type 7 series and 8.4 series, which are End-of-Life (EOL), are affected by the vulnerability as well.

Action-Not Available
Vendor-Six Apart Ltd.
Product-Movable Type Premium (Cloud Edition)Movable Type Advanced (Software Edition)Movable Type Premium (Advanced Edition) (Software Edition)Movable Type Premium (Software Edition)Movable Type (Software Edition)Movable Type (Cloud Edition)
CWE ID-CWE-1236
Improper Neutralization of Formula Elements in a CSV File
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Matching Score-6
Assigner-JPCERT/CC
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Matching Score-6
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CVSS Score-8.8||HIGH
EPSS-0.85% / 74.53%
||
7 Day CHG~0.00%
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Updated-04 Aug, 2024 | 08:30
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Movable Type series (Movable Type 7 r.4606 (7.2.1) and earlier (Movable Type 7), Movable Type Advanced 7 r.4606 (7.2.1) and earlier (Movable Type Advanced 7), Movable Type for AWS 7 r.4606 (7.2.1) and earlier (Movable Type for AWS 7), Movable Type 6.5.3 and earlier (Movable Type 6.5), Movable Type Advanced 6.5.3 and earlier (Movable Type Advanced 6.5), Movable Type 6.3.11 and earlier (Movable Type 6.3), Movable Type Advanced 6.3.11 and earlier (Movable Type 6.3), Movable Type Premium 1.29 and earlier, and Movable Type Premium Advanced 1.29 and earlier) allow remote authenticated attackers to upload arbitrary files and execute a php script via unspecified vectors.

Action-Not Available
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CWE ID-CWE-434
Unrestricted Upload of File with Dangerous Type
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Matching Score-4
Assigner-JPCERT/CC
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EPSS-0.03% / 7.47%
||
7 Day CHG~0.00%
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Known To Be Used In Ransomware Campaigns?-Not Available
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Product-powercmsPowerCMS
CWE ID-CWE-434
Unrestricted Upload of File with Dangerous Type
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Matching Score-4
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EPSS-0.28% / 51.12%
||
7 Day CHG~0.00%
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Updated-02 Aug, 2024 | 23:47
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
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CWE ID-CWE-434
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Matching Score-4
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EPSS-0.40% / 60.51%
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7 Day CHG~0.00%
Published-30 Sep, 2023 | 00:00
Updated-23 Sep, 2024 | 16:12
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
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Unrestricted Upload of File with Dangerous Type in GitHub repository thorsten/phpmyfaq prior to 3.1.8.

Action-Not Available
Vendor-Thorsten Rinne (phpMyFAQ)
Product-phpmyfaqthorsten/phpmyfaq
CWE ID-CWE-434
Unrestricted Upload of File with Dangerous Type
Details not found