Cross-site scripting in Six Apart Ltd. Movable Type series
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 Movable Type series (Movable Type 7 r.4603 and earlier (Movable Type 7), Movable Type 6.5.2 and earlier (Movable Type 6.5), Movable Type Advanced 7 r.4603 and earlier (Movable Type Advanced 7), Movable Type Advanced 6.5.2 and earlier (Movable Type Advanced 6.5), Movable Type Premium 1.26 and earlier (Movable Type Premium), and Movable Type Premium Advanced 1.26 and earlier (Movable Type Premium Advanced)) allows remote attackers to inject arbitrary web script or HTML in the block editor and the rich text editor via a specially crafted URL.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Six Apart Ltd. | Movable Type series | Movable Type 7 r.4603 and earlier (Movable Type 7), Movable Type 6.5.2 and earlier (Movable Type 6.5), Movable Type Advanced 7 r.4603 and earlier (Movable Type Advanced 7), Movable Type Advanced 6.5.2 and earlier (Movable Type Advanced 6.5), Movable Type Premium 1.26 and earlier (Movable Type Premium), and Movable Type Premium Advanced 1.26 and earlier (Movable Type Premium Advanced) | — | No fix listed | CNA |
- Movable Type series VendorSix Apart Ltd. Affected Movable Type 7 r.4603 and earlier (Movable Type 7), Movable Type 6.5.2 and earlier (Movable Type 6.5), Movable Type Advanced 7 r.4603 and earlier (Movable Type Advanced 7), Movable Type Advanced 6.5.2 and earlier (Movable Type Advanced 6.5), Movable Type Premium 1.26 and earlier (Movable Type Premium), and Movable Type Premium Advanced 1.26 and earlier (Movable Type Premium Advanced) Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:sixapart:movable_type:*:*:*:*:*:*:*:* | 6.5.0 – 6.5.2; 7.0 – 7.1.4 | Vulnerable | Sixapart |
| cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:* | up to 1.26 | Vulnerable | Sixapart |
| cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium:*:*:* | up to 1.26 | Vulnerable | Sixapart |
| cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:* | 6.5.0 – 6.5.2; 7.0 – 7.1.4 | Vulnerable | Sixapart |
- cpe:2.3:a:sixapart:movable_type:*:*:*:*:*:*:*:* Versions 6.5.0 – 6.5.2; 7.0 – 7.1.4 Vulnerable ·Sixapart
- cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:* Versions up to 1.26 Vulnerable ·Sixapart
- cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium:*:*:* Versions up to 1.26 Vulnerable ·Sixapart
- cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:* Versions 6.5.0 – 6.5.2; 7.0 – 7.1.4 Vulnerable ·Sixapart
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-5528
- 2026-10-03 Alias added: GHSA-5928-fcw8-m7f4
References
More Six Apart Ltd. vulnerabilities
- 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
Sources
- CVE-2020-5528 · CVE Program
- CVE-2020-5528 · NVD
- FIRST EPSS
- GHSA-5928-fcw8-m7f4 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences