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CVE-2026-21393

MEDIUM CVSS 4.0: 4.8 EPSS 0.01%
Updated Feb 04, 2026
Movable
Parameter Value
CVSS 4.8 (MEDIUM)
Type CWE-79 (Cross-Site Scripting (XSS))
Vendor Movable
Public PoC No

Movable Type contains a stored cross-site scripting vulnerability in Edit Comment. If crafted input is stored by an attacker, arbitrary script may be executed on a logged-in user's web browser. Note that Movable Type 7 series and 8.4 series, which are End-of-Life (EOL), are affected by the vulnerability as well.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
Active
User action required

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
None
No disruption

CVSS Vector v4.0