Code execution via unescaped CSV formula cells
Published Feb 4, 2026 · Updated Feb 4, 2026
CSV formula injection in Six Apart Movable Type affected releases allows remote authenticated users to embed code in exported CSV files. The CSV export function writes attacker-controlled cell values without escaping leading formula characters, so spreadsheet software interprets them as formulas. Exploitation requires a product user to supply the value and a victim to download and open the CSV; the formula then executes in the victim's environment.
Summary
What happened
CSV formula injection in Six Apart Movable Type affected releases allows remote authenticated users to embed code in exported CSV files. The CSV export function writes attacker-controlled cell values without escaping leading formula characters, so spreadsheet software interprets them as formulas. Exploitation requires a product user to supply the value and a victim to download and open the CSV; the formula then executes in the victim's environment.
The record
- CVE
- CVE-2026-24447
- Published
- Feb 4, 2026
- Updated
- Feb 4, 2026
- Vendor
- Six Apart Ltd.
- Product
- Movable Type Advanced
- Classifications
- CWE-1236, T1204.002
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 4, 2026CVE publishedPublication date reported by the CVE source.
- Feb 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=8.0.2 to 8.0.8 (8.0 series)
- Affected versionversion=8.8.0 to 8.8.1 (8.8 series)
- Affected versionversion=9.0.4 to 9.0.5 (9.0 series)
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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo