Platform
perl
Component
movable-type
Fixed in
9.1.1
9.0.7
8.8.3
8.0.10
9.1.1
9.0.7
8.8.3
8.0.10
9.1.1
9.0.7
9.1.1
9.0.7
2.14.1
2.14.1
2.14.1
5.1.1
5.2.1
5.2.2
6.0.1
6.0.2
7.0.1
8.4.1
1.0.1
CVE-2026-25776 represents a code injection vulnerability discovered in Movable Type, a content management system developed by Six Apart Ltd. This flaw allows an attacker to inject and execute arbitrary Perl scripts, potentially gaining unauthorized access and control over the system. The vulnerability affects versions 8.0.9 through 9.1.0 of Movable Type. A security patch addressing this issue has been released in version 9.1.1.
CVE-2026-25776 in Movable Type, provided by Six Apart Ltd., presents a significant risk due to a code injection vulnerability. This flaw allows an attacker to execute arbitrary Perl scripts on the affected system. The CVSS score of 9.8 indicates critical severity, meaning successful exploitation could result in full server compromise and the confidentiality, integrity, and availability of data being jeopardized. The nature of the code injection allows attackers to modify or steal sensitive information, install malware, or even use the server as a launching point for further attacks within the network. The lack of a KEV (Kernel Exploit Visibility) suggests the vulnerability might not be widely documented in threat intelligence sources, increasing the urgency of applying the fix.
The vulnerability lies in the way Movable Type handles certain inputs, allowing an attacker to inject malicious Perl code. Exploitation is believed to require authentication, meaning the attacker needs valid access to the Movable Type system. However, once authenticated, the attacker can execute arbitrary code with the Movable Type user's privileges. The impact of exploitation can vary depending on the server configuration and user permissions. Administrators are advised to review Movable Type configuration and apply least privilege principles to limit potential damage in case of successful exploitation. The lack of detailed information regarding the specific attack vector makes precise risk assessment difficult.
Exploit Status
EPSS
0.06% (20% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2026-25776 is to update Movable Type to version 9.1.1 or later. This version contains a patch that directly addresses the code injection vulnerability. In the interim, as a temporary measure, it is recommended to restrict access to the Movable Type admin panel to authorized users and monitor system logs for suspicious activity. Implementing a web application firewall (WAF) can also help block exploitation attempts. Thorough testing after the update is crucial to ensure the fix doesn't cause compatibility issues with other system components. Prompt application of this update is essential to protect against potential attacks.
Update Movable Type to version 9.1.1 or later to mitigate the code injection vulnerability. This update corrects how certain inputs are processed, preventing the execution of arbitrary Perl scripts. See the release notes for detailed upgrade instructions.
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Movable Type is a content management system (CMS) used to create and manage blogs and websites.
Version 9.1.1 patches the CVE-2026-25776 vulnerability, which allows for arbitrary code execution.
As a temporary measure, restrict access to the admin panel and monitor system logs.
A web application firewall (WAF) can block exploitation attempts of the vulnerability.
Consult the official Movable Type documentation and Six Apart Ltd.'s security resources.
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