Unauthenticated Perl code execution via filter processing
Published Apr 8, 2026 · Updated Apr 8, 2026
Code injection in Six Apart Ltd. Movable Type 9.1.0 and earlier allows remote attackers to execute arbitrary Perl code through filter processing. Six Apart has not published the exact filter parameter or unsafe evaluation operation that converts untrusted filter input into executable Perl. The flaw is reachable without authentication when the Listing Framework is enabled in the administrative console or the Data API is available, giving code execution in the server process context.
Summary
What happened
Code injection in Six Apart Ltd. Movable Type 9.1.0 and earlier allows remote attackers to execute arbitrary Perl code through filter processing. Six Apart has not published the exact filter parameter or unsafe evaluation operation that converts untrusted filter input into executable Perl. The flaw is reachable without authentication when the Listing Framework is enabled in the administrative console or the Data API is available, giving code execution in the server process context.
The record
- CVE
- CVE-2026-25776
- Published
- Apr 8, 2026
- Updated
- Apr 8, 2026
- Vendor
- Six Apart Ltd.
- Product
- Movable Type Advanced
- Classifications
- CWE-94, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 8, 2026CVE publishedPublication date reported by the CVE source.
- Apr 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=8.0.9 and earlier
- Affected versionversion=8.8.2 and earlier
- Affected versionversion=9.0.6 and earlier
- Affected versionversion=9.1.0 and earlier
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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