Read the docs
TI-2021-04037 Aliases CVE-2021-20812GHSA-2554-pph3-4jmx

Cross-site scripting in Six Apart Ltd. Movable Type

Priority LOW 29CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

Cross-site scripting vulnerability in Setting screen of Server Sync of Movable Type (Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series) and Movable Type Premium Advanced 1.44 and earlier) allows remote attackers to inject arbitrary script or HTML via unspecified vectors.

Why it matters now

EPSS 0.009 59th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Six Apart Ltd.Movable TypeMovable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series) and Movable Type Premium Advanced 1.44 and earlier—No fix listedCNA
  • Movable Type VendorSix Apart Ltd. Affected Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series) and Movable Type Premium Advanced 1.44 and earlier Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium_advanced:*:*:*up to 1.44VulnerableSixapart
cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:*7.0 to before 7.8.0VulnerableSixapart
  • cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium_advanced:*:*:* Versions up to 1.44 Vulnerable ·Sixapart
  • cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:* Versions 7.0 to before 7.8.0 Vulnerable ·Sixapart

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-20812
  2. 2026-10-03 Alias added: GHSA-2554-pph3-4jmx

References

Advisory 2

  • TI-2021-04052 OS command injection in Six Apart Ltd. Movable Type CVSS 3.1CRITICAL 9.8
  • TI-2026-20843 Code injection in Six Apart Ltd. Movable Type CVSS 4.0CRITICAL 9.3
  • TI-2026-69104 Code injection in Movable Type upgrade script CVSS 4.0CRITICAL 9.3
  • TI-2022-17791 Code injection in Six Apart Ltd. Movable Type XMLRPC API CVSS 3.1CRITICAL 9.8
  • TI-2026-69105 SQL injection in Movable Type Site Search function CVSS 4.0HIGH 8.8
  • TI-2020-04547 Unrestricted file upload in Six Apart Ltd. Movable Type CVSS 3.1HIGH 8.8
See all 53 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences