CVE-2020-5576 [High] | CSRF in Movable Type

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.14%	0.84%	+0.70%
2	2024-10-10	0.16%	0.14%	-0.02%
3	2024-06-23	—	0.16%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.14%

0.84%

+0.70%

2024-10-10

0.16%

0.14%

-0.02%

2024-06-23

—

0.16%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.8	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	5.9	[email protected]
6.8	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	8.6	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.8

3.1

HIGH

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

5.9

[email protected]

6.8

2.0

MEDIUM

AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

8.6

6.4

[email protected]

OS Trackers for CVE-2020-5576

vendor	priority	summary	link
`ubuntu`	medium	CVE-2020-5576 medium priority: Ubuntu including 1 source packages (movabletype-opensource), 7 status rows across 7 suites (bionic, eoan, focal, precise, trusty, upstream, xenial): DNE 5, ignored 1, needs-triage 1.	https://ubuntu.com/security/CVE-2020-5576

Affected software / configurations for CVE-2020-5576

Vendor	Product	Version	Raw CPE
sixapart	movable_type	<= 1.29	cpe:2.3:a:sixapart:movable_type:::::advanced:::*
sixapart	movable_type	<= 1.29	cpe:2.3:a:sixapart:movable_type:::::premium:::*
sixapart	movable_type	>= 6.3, <= 6.3.11	cpe:2.3:a:sixapart:movable_type:::::-:::*
sixapart	movable_type	>= 6.3, <= 6.3.11	cpe:2.3:a:sixapart:movable_type:::::advanced:::*
sixapart	movable_type	>= 6.5.0, <= 6.5.3	cpe:2.3:a:sixapart:movable_type:::::-:::*
sixapart	movable_type	>= 6.5.0, <= 6.5.3	cpe:2.3:a:sixapart:movable_type:::::advanced:::*
sixapart	movable_type	>= 7.0, <= 7.2.1	cpe:2.3:a:sixapart:movable_type::::::aws::*
sixapart	movable_type	>= 7.0, <= 7.2.1	cpe:2.3:a:sixapart:movable_type:::::-:::*
sixapart	movable_type	>= 7.0, <= 7.2.1	cpe:2.3:a:sixapart:movable_type:::::advanced:::*

References for CVE-2020-5576

URL	Tags
https://jvn.jp/en/jp/JVN28806943/index.html	Third Party Advisory VDB Entry
https://movabletype.org/news/2020/05/mt-730-660-6312-released.html	Vendor Advisory

URL

CVE-2020-5576

Exploit prediction scoring system (EPSS) score for CVE-2020-5576

Common vulnerability scoring system (CVSS) metrics for CVE-2020-5576

Weakness enumeration for CVE-2020-5576

OS Trackers for CVE-2020-5576

Affected software / configurations for CVE-2020-5576

References for CVE-2020-5576