CVE-2026-21393: Six Apart Ltd. Movable Type (Software Edition) vulnerability
Six Apart Ltd. · Movable Type (Software Edition)
Affected: Six Apart Ltd. Movable Type (Software Edition) · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 14% of scored CVEs
DescriptionCVE.org
Movable Type contains a stored cross-site scripting vulnerability in Edit Comment. If crafted input is stored by an attacker, arbitrary script may be executed on a logged-in user's web browser. Note that Movable Type 7 series and 8.4 series, which are End-of-Life (EOL), are affected by the vulnerability as well.
Affected products6
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Six Apart Ltd. · Movable Type (Software Edition)9.0.4 to 9.0.5 (9.0 series); 8.8.0 to 8.8.1 (8.8 series); 8.0.2 to 8.0.8 (8.0 series)
- Six Apart Ltd. · Movable Type Advanced (Software Edition)9.0.4 to 9.0.5 (9.0 series); 8.8.0 to 8.8.1 (8.8 series); 8.0.2 to 8.0.8 (8.0 series)
- Six Apart Ltd. · Movable Type Premium (Software Edition)9.0.4 (MTP 9.0 series); 2.13 and earlier (MTP 2 series)
- Six Apart Ltd. · Movable Type Premium (Advanced Edition) (Software Edition)9.0.4 (MTP 9.0 series); 2.13 and earlier (MTP 2 series)
- Six Apart Ltd. · Movable Type (Cloud Edition)9.0.5 (9 series); 8.8.1 (8 series)
- Six Apart Ltd. · Movable Type Premium (Cloud Edition)9.0.5 (9 series); 2.12 (MTP 2 series)
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Weakness
- Cross-site Scripting
- Vendor
- Six Apart Ltd.
- Published
- February 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-21393 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.