CVE-2026-21393

MEDIUM
2026-02-04 [email protected]
5.4
CVSS 3.0
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CVSS VectorNVD

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Feb 04, 2026 - 07:16 nvd
MEDIUM 5.4

DescriptionNVD

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.

AnalysisAI

Stored XSS in Movable Type's Edit Comment feature allows authenticated attackers to inject malicious scripts that execute in logged-in users' browsers, affecting both current and end-of-life versions including the 7 and 8.4 series. An attacker with login credentials can craft and store malicious input that triggers arbitrary script execution when other users view or interact with comments. …

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RemediationAI

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

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CVE-2026-21393 vulnerability details – vuln.today

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