CVE-2020-23653

ThinkAdmin insecure unserialize vulnerability

9.8 CriticalFix available

An insecure unserialize vulnerability was discovered in ThinkAdmin versions 4.x through 6.x in app/admin/controller/api/Update.php and app/wechat/controller/api/Push.php, which may lead to arbitrary remote code execution.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

4.28%Up 3.4 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

Record: CVE-2020-23653
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-502
Updated: 2026-11-02

CVE List No score

Record: CVE-2020-23653
Updated: 2026-11-02

EUVDEUVD-2022-2451 No score

Record: EUVD-2022-2451
Updated: 2026-11-03

GitHub AdvisoriesGHSA-4vp2-mj4m-69m4 9.8

ThinkAdmin insecure unserialize vulnerability

An insecure unserialize vulnerability was discovered in ThinkAdmin versions 4.x through 6.x in app/admin/controller/api/Update.php and app/wechat/controller/api/Push.php, which may lead to arbitrary remote code execution.

Record: GHSA-4vp2-mj4m-69m4
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-502
Updated: 2026-11-02

OSV 9.8

Record: CVE-2020-23653
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVGHSA-4vp2-mj4m-69m4 9.8

ThinkAdmin insecure unserialize vulnerability

Record: GHSA-4vp2-mj4m-69m4
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-502
Updated: 2026-11-02

Affected products

thinkadmin

Affected packages

Affected packages
Package	Affected	Fixed
`zoujingli/thinkadmin` Packagist	4.0 up to 6.1.0	6.1.0

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-23653 is a critical vulnerability (CVSS 9.8) in Thinkadmin, published January 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.28%, the 91st percentile. Fixed in zoujingli/thinkadmin 6.1.0.