Stored Cross-Site Scripting Vulnerability in Osom Blocks Plugin for WordPress
CVE-2025-5940

5.4MEDIUM

Key Information:

Vendor

WordPress
Status
Osom Blocks – Custom Post Type Listing Block
Vendor
CVE Published:
27 June 2025

What is CVE-2025-5940?

The Osom Blocks plugin for WordPress suffers from a Stored Cross-Site Scripting vulnerability due to inadequate input sanitization and output escaping in the 'class_name' parameter. This issue affects all versions up to and including 1.2.1, allowing attackers with Contributor-level permissions and above to inject arbitrary web scripts. These scripts can execute when users access the compromised pages, potentially compromising user data and site integrity.

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Affected Version(s)

Osom Blocks – Custom Post Type listing block * <= 1.2.1

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/osomblocks/tru...
https://wordpress.org/plugins/osomblocks/#developers

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Peter Thaleikis
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