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CVE-2025-53522

MEDIUM
6.9
CVSS Score
Published: August 20, 2025 at 04:22 AM UTC
Updated: June 17, 2026 at 09:38 AM UTC
4 products affected across 1 vendorMovable TypeMovable Type PremiumMovable Type Premium Advanced

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Severity
MEDIUM6.9
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Movable Type contains an issue with use of less trusted source. If exploited, tampered email to reset a password may be sent by a remote unauthenticated attacker.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Movable Type· Sixapart
60%
v ≥ 8.4.0v ≤ 55088.0.0 ≤ v ≤ 8.0.67 r.5508 (7 series)8.6.0 (8 series)
Movable Type Advanced· Sixapart
60%
v ≥ 8.4.0v ≤ 55088.0.0 ≤ v ≤ 8.0.6
Movable Type Premium· Sixapart
60%
v ≤ 1.66v ≤ 2.091.66 (1 series)2.09 (2 series)
Movable Type Premium Advanced· Sixapart
60%
v ≤ 1.66v ≤ 2.09

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Source: [email protected]
https://jvn.jp/en/jp/JVN76729865/
Source: [email protected]
https://movabletype.org/news/2025/08/mt-843-released.html

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.9MEDIUMjpcert
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-348

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