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CVE-2020-5577

22
FAUCET Score

CVE-2020-5577 is a critical arbitrary file upload vulnerability affecting multiple versions of Movable Type, Movable Type Advanced, Movable Type for AWS, and Movable Type Premium products. This flaw allows remote authenticated attackers to upload and execute PHP scripts, leading to complete compromise of the affected system. With a CVSS score of 8.8 (High), the vulnerability is easily exploitable over the network with low attack complexity and requires only low privileges, resulting in high impacts to confidentiality, integrity, and availability. There is currently no public exploit code available, nor is there evidence of active exploitation or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.29CPE matchmatch criteria
cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:*
<= 1.29CPE matchmatch criteria
cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium:*:*:*
>= 6.3, <= 6.3.11CPE matchmatch criteria
cpe:2.3:a:sixapart:movable_type:*:*:*:*:-:*:*:*
>= 6.3, <= 6.3.11CPE matchmatch criteria
cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:*
>= 6.5.0, <= 6.5.3CPE matchmatch criteria
cpe:2.3:a:sixapart:movable_type:*:*:*:*:-:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.73%
Probability of exploitation in next 30 days
EPSS Percentile
75.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0173 is in the 73rd percentile among its peer group of 17,844 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

jvn.jp / en/jp/JVN28806943/index.html
Third Party AdvisoryVDB Entry
movabletype.org / news/2020/05/mt-730-660-6312-released.html
Release NotesVendor Advisory