Cross-site scripting in Six Apart Ltd. Movable Type
Priority LOW 21CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
Movable Type contains a stored cross-site scripting vulnerability in Edit ContentData page. If crafted input is stored by an attacker with "ContentType Management" privilege, an arbitrary script may be executed on the web browser of the user who accesses Edit ContentData page.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00234 14th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Six Apart Ltd. | Movable Type (Software Edition) | 8.4.0 to 8.4.3 (8.4 series); 8.0.0 to 8.0.7 (8.0 series); 7 r.5509 and earlier (7 series) | — | No fix listed | CNA |
| Six Apart Ltd. | Movable Type Advanced (Software Edition) | 8.4.0 to 8.4.3 (8.4 series); 8.0.0 to 8.0.7 (8.0 series); 7 r.5509 and earlier (7 series) | — | No fix listed | CNA |
| Six Apart Ltd. | Movable Type Premium (Software Edition) | 2.10 and earlier (2 series); 1.67 and earlier (1 series) | — | No fix listed | CNA |
| Six Apart Ltd. | Movable Type Premium (Advanced Edition) (Software Edition) | 2.10 and earlier (2 series); 1.67 and earlier (1 series) | — | No fix listed | CNA |
| Six Apart Ltd. | Movable Type (Cloud Edition) | 8.7.0 (8 series); 7 r.5509 (7 series) | — | No fix listed | CNA |
| Six Apart Ltd. | Movable Type Premium (Cloud Edition) | 2.10 (2 series); 1.67 (1 series) | — | No fix listed | CNA |
- Movable Type (Software Edition) VendorSix Apart Ltd. Affected 8.4.0 to 8.4.3 (8.4 series); 8.0.0 to 8.0.7 (8.0 series); 7 r.5509 and earlier (7 series) Fixed in — No fix listed CNA
- Movable Type Advanced (Software Edition) VendorSix Apart Ltd. Affected 8.4.0 to 8.4.3 (8.4 series); 8.0.0 to 8.0.7 (8.0 series); 7 r.5509 and earlier (7 series) Fixed in — No fix listed CNA
- Movable Type Premium (Software Edition) VendorSix Apart Ltd. Affected 2.10 and earlier (2 series); 1.67 and earlier (1 series) Fixed in — No fix listed CNA
- Movable Type Premium (Advanced Edition) (Software Edition) VendorSix Apart Ltd. Affected 2.10 and earlier (2 series); 1.67 and earlier (1 series) Fixed in — No fix listed CNA
- Movable Type (Cloud Edition) VendorSix Apart Ltd. Affected 8.7.0 (8 series); 7 r.5509 (7 series) Fixed in — No fix listed CNA
- Movable Type Premium (Cloud Edition) VendorSix Apart Ltd. Affected 2.10 (2 series); 1.67 (1 series) Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-54856
- 2026-10-03 Alias added: GHSA-4wvq-85hg-6256
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-2025-54856 · CVE Program
- CVE-2025-54856 · NVD
- FIRST EPSS
- GHSA-4wvq-85hg-6256 · 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