CVE-2025-55706: Six Apart Ltd Movable Type Advanced Software Edition

Medium severity, CVSS 5.1. EPSS: 0.2% chance of exploitation in the next 30 days.

URL redirection to untrusted site ('Open Redirect') issue exists in Movable Type. If this vulnerability is exploited, an invalid parameter may be inserted into the password reset page, which may lead to redirection to an arbitrary URL.

Affected products

• Six Apart Ltd Movable Type Advanced Software Edition
• Six Apart Ltd Movable Type Cloud Edition: version 8.6.0 (8 series) only
• Six Apart Ltd Movable Type Premium Advanced Edition Software Edition
• Six Apart Ltd Movable Type Premium Cloud Edition: version 2.09 (2 series) only; version 1.66 (1 series) only
• Six Apart Ltd Movable Type Premium Software Edition
• Six Apart Ltd Movable Type Software Edition

Published 2025-08-20. Last modified 2026-06-17.