What is CVE-2020-5576?

CVE-2020-5576 is a high-severity vulnerability in Sixapart Movable Type, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2020-05-14.

How severe is CVE-2020-5576?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in Sixapart Movable Type

CVE-2020-5576

Cross-site request forgery (CSRF) vulnerability in Movable Type series (Movable Type 7 r.4606 (7.2.1) and earlier (Movable Type 7), Movable Type Advanced 7 r.4606 (7.2.1) and earlier (Movable Type Advanced 7), Movable Type for AWS 7 r.4606 (7.2.1) and earlier (Movable Type for AWS 7), Movable Type 6.5.3 and earlier (Movable Type 6.5), Movable Type Advanced 6.5.3 and earlier (Movable Type Advanced 6.5), Movable Type 6.3.11 and earlier (Movable Type 6.3), Movable Type Advanced 6.3.11 and earlier (Movable Type 6.3), Movable Type Premium 1.29 and earlier, and Movable Type Premium Advanced 1.29 and earlier) allows remote attackers to hijack the authentication of administrators via unspecified vectors.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2020-05-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (56.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Sixapart Movable Type
Six Apart Ltd. Movable Type — versions Movable Type 7 r.4606 (7.2.1) and earlier (Movable Type 7), Movable Type Advanced 7 r.4606 (7.2.1) and earlier (Movable Type Advanced 7), Movable Type for AWS 7 r.4606 (7.2.1) and earlier (Movable Type for AWS 7), Movable Type 6.5.3 and earlier (Movable Type 6.5), Movable Type Advanced 6.5.3 and earlier (Movable Type Advanced 6.5), Movable Type 6.3.11 and earlier (Movable Type 6.3), Movable Type Advanced 6.3.11 and earlier (Movable Type 6.3), Movable Type Premium 1.29 and earlier, and Movable Type Premium Advanced 1.29 and earlier

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

movabletype.org/news/2020/05/mt-730-660-6312-released.html (Vendor Advisory)
jvn.jp/en/jp/JVN28806943/index.html (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2020-5576?: CVE-2020-5576 is a high-severity vulnerability in Sixapart Movable Type, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2020-05-14.
How severe is CVE-2020-5576?: High severity. CVSS v3 base score is 8.8 out of 10.