CVE-2026-25776
Movable Type, a content management system from Six Apart, has a code injection flaw that lets attackers run arbitrary Perl code on the server. The vulnerability is present in several recent releases, including 9.0.5, 9.0.6, and 9.1.0. It can be exploited remotely without authentication.
No official fix yet. If none appears within 45 days of first tracking, this entry is removed automatically.
Who is affected
Six Apart Movable Type CMS, specifically versions 9.0.5, 9.0.6, and 9.1.0 (and other 9.x releases).
Real-world impact
An attacker who can reach the vulnerable site could run any Perl script on the server, potentially taking full control, stealing data, or installing malware.
Why this severity
The CVSS score of 9.3 reflects the vulnerability’s high impact: it allows remote code execution with no authentication or user interaction, giving an attacker complete control over the affected system.
What to do about it
No official fix or mitigation is documented in the sources yet. Monitor the vendor advisory and apply the patch as soon as it is released.
No fix documented in sources
Timeline
- Apr 8, 2026 · Apr 8, 2026PublishedDisclosed and added to the National Vulnerability Database.
- Jul 25, 2026 · 11d agoAdvisory updatedThe NVD record was last revised.
How it’s attacked
References & advisories
- jvn.jp/en/jp/JVN66473735/third party advisory
- movabletype.org/news/2026/04/mt-907-release…vendor advisory
- sixapart.jp/movabletype/news/2026/04/08…vendor advisory