CVE-2020-5574: Sixapart Movable Type

Medium severity, CVSS 5.3. EPSS: 1.2% chance of exploitation in the next 30 days.

HTML attribute value injection vulnerability in Movable Type series (Movable Type 7 r.4606 (7.2.1) and earlier (Movable Type 7), Movable Type Advanced 7 r.4606 (7.2.1) and earlier (Movable Type Advanced 7), Movable Type for AWS 7 r.4606 (7.2.1) and earlier (Movable Type for AWS 7), Movable Type 6.5.3 and earlier (Movable Type 6.5), Movable Type Advanced 6.5.3 and earlier (Movable Type Advanced 6.5), Movable Type 6.3.11 and earlier (Movable Type 6.3), Movable Type Advanced 6.3.11 and earlier (Movable Type 6.3), Movable Type Premium 1.29 and earlier, and Movable Type Premium Advanced 1.29 and earlier) allows remote attackers to inject arbitrary HTML attribute value via unspecified vectors.

Affected products

• Sixapart Movable Type: up to and including 1.29; from 6.3, up to and including 6.3.11; from 6.5.0, up to and including 6.5.3; from 7.0, up to and including 7.2.1

Published 2020-05-14. Last modified 2026-06-17.