# CVE-2026-25776: Six Apart Movable Type code injection in Listing Framework

Source: https://junglewise.ai/threats/cve-2026-25776-six-apart-movable-type-code-injection-in-listing-framework  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-08. Updated: 2026-07-25  
License: CC BY 4.0 with a link back

CVE-2026-25776 · Severity: critical · CVSS 9.8 · Published 2026-04-08

Movable Type, a popular content management system (CMS), contains a critical security flaw in its core framework. This vulnerability allows an unauthenticated attacker to remotely execute malicious code on the server hosting the website. If exploited, an attacker could gain full control over the website, access sensitive customer data, or disrupt operations entirely.

Technologies: [Six Apart Ltd. Movable Type Premium](https://junglewise.ai/threats/technologies/movable-type-premium). Vendors: [Six Apart Ltd.](https://junglewise.ai/threats/vendors/six-apart-ltd).

## Quick answers

**Is CVE-2026-25776 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-25776 being exploited in the wild.

**How severe is CVE-2026-25776?** Critical severity, with a CVSS score of 9.8, published 8 April 2026.

**Which products and versions are affected?** Six Apart Ltd. Movable Type Premium 9.1.0 and earlier, 9.0.6 and earlier, 2.14 and earlier, 1.0 to 1.68 (EOL).

**Is there a fix for CVE-2026-25776?** A patch was published on 2026-04-08. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-25776 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-25776?** Check whether you run Six Apart Ltd. Movable Type Premium at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A code injection vulnerability (CWE-94) exists in the Listing Framework component of Movable Type, which is utilized by both the Administrative Panel (mt.cgi) and the Data API (mt-data-api.cgi). The flaw resides in the filtering process of the Listing Framework, where improper validation allows for the execution of arbitrary Perl scripts. An unauthenticated attacker can exploit this over the network if the Admin Panel or Data API is accessible from the internet. Successful exploitation results in full Remote Code Execution (RCE) with the privileges of the web server user. Patches have been released in versions 9.1.1, 9.0.7, 8.8.3, and 8.0.10. Temporary workarounds include restricting access to mt.cgi or disabling the Data API by removing mt-data-api.cgi.

## Affected products

- Six Apart Ltd. Movable Type 9.1.0 and earlier, 9.0.6 and earlier, 8.8.2 and earlier, 8.0.9 and earlier, 5.1 to 8.4.4 (EOL)
- Six Apart Ltd. Movable Type Advanced 9.1.0 and earlier, 9.0.6 and earlier, 8.8.2 and earlier, 8.0.9 and earlier, 5.1 to 8.4.4 (EOL)
- Six Apart Ltd. Movable Type Premium 9.1.0 and earlier, 9.0.6 and earlier, 2.14 and earlier, 1.0 to 1.68 (EOL)
- Six Apart Ltd. Movable Type Premium Advanced Edition 9.1.0 and earlier, 9.0.6 and earlier, 2.14 and earlier

## Timeline

- 2026-04-08: disclosed
- 2026-04-08: patched
- 2026-04-08: advisory

## References

- [https://jvn.jp/en/jp/JVN66473735/](https://jvn.jp/en/jp/JVN66473735/)
- [https://movabletype.org/news/2026/04/mt-907-released.html](https://movabletype.org/news/2026/04/mt-907-released.html)
- [https://www.sixapart.jp/movabletype/news/2026/04/08-1100.html](https://www.sixapart.jp/movabletype/news/2026/04/08-1100.html)

## Related threats

- [Movable Type code injection in Dynamic Publishing](https://junglewise.ai/threats/cve-2026-117687-movable-type-provided-by-six-apart-ltd-contains-a-code-injection)
- [Six Apart Movable Type missing authorization in upgrade process](https://junglewise.ai/threats/cve-2026-44392-six-apart-movable-type-missing-authorization-in-upgrade-process)