CVE-2025-5923

Game Review Block <= 4.8.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via className Parameter

6.4 Medium

The Game Review Block plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘className’ parameter in all versions up to, and including, 4.8.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Attack profile

How easy it is to exploit

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

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

0.29%Up 0.3 points since Jun 13, 2025

What each source reports

CVE List Score used 6.4

Game Review Block <= 4.8.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via className Parameter

Record: CVE-2025-5923
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2025-18255 6.4

Record: EUVD-2025-18255
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-565j-r5pv-8mmf 6.4

The Game Review Block plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ...

Record: GHSA-565j-r5pv-8mmf
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

NVD 6.4

Record: CVE-2025-5923
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 6.4

Game Review Block <= 4.8.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via className Parameter

Record: CVE-2025-5923
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

Affected products

marcdk game review block

History

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

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

In short

CVE-2025-5923 is a medium vulnerability (CVSS 6.4) in Marcdk Game Review Block, published June 13, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.29%, the 22nd percentile. No source names a fixed version.