Published:2019/11/13  Last Updated:2019/11/13

Movable Type vulnerable to open redirect


Movable Type contains an open redirect vulnerability.

Products Affected

  • Movable Type 7 r.4602 (7.1.3) and earlier (Movable Type 7)
  • Movable Type 6.5.0 and 6.5.1 (Movable Type 6.5)
  • Movable Type 6.3.9 and earlier (Movable Type 6.3.x, 6.2.x, 6.1.x, 6.0.x)
  • Movable Type Advanced 7 r.4602 (7.1.3) and earlier (Movable Type 7)
  • Movable Type Advanced 6.5.0 and 6.5.1 (Movable Type 6.5)
  • Movable Type Advanced 6.3.9 and earlier (Movable Type 6.3.x, 6.2.x, 6.1.x, 6.0.x)
  • Movable Type Premium 1.24 and earlier (Movable Type Premium)
  • Movable Type Premium (Advanced Edition) 1.24 and earlier (Movable Type Premium)


Movable Type provided by Six Apart Ltd. contains an open redirect vulnerability (CWE-601).


When accessing a specially crafted URL, the user may be redirected to an arbitrary website. As a result, the user may become a victim of a phishing attack.


Update the Software
Update the software to the latest version according to the information provided by the developer.
The developer states that the support for Movable Type 5.x and earlier versions has been ended, thus verification on impacts which may be caused by this vulnerability is not conducted and any countermeasures for this vulnerability are not provided.  Therefore the developer recommends users to upgrade the software to the supported versions, such as Movable Type 6.5 or 7.

Vendor Status

Vendor Status Last Update Vendor Notes
Six Apart Ltd. Vulnerable 2019/11/13 Six Apart Ltd. website


JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Base Score: 4.7
Attack Vector(AV) Physical (P) Local (L) Adjacent (A) Network (N)
Attack Complexity(AC) High (H) Low (L)
Privileges Required(PR) High (H) Low (L) None (N)
User Interaction(UI) Required (R) None (N)
Scope(S) Unchanged (U) Changed (C)
Confidentiality Impact(C) None (N) Low (L) High (H)
Integrity Impact(I) None (N) Low (L) High (H)
Availability Impact(A) None (N) Low (L) High (H)
Base Score: 2.6
Access Vector(AV) Local (L) Adjacent Network (A) Network (N)
Access Complexity(AC) High (H) Medium (M) Low (L)
Authentication(Au) Multiple (M) Single (S) None (N)
Confidentiality Impact(C) None (N) Partial (P) Complete (C)
Integrity Impact(I) None (N) Partial (P) Complete (C)
Availability Impact(A) None (N) Partial (P) Complete (C)


Hidetomo Hosono of EG Secure Solutions Inc. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
CVE CVE-2019-6025
JVN iPedia JVNDB-2019-000069