CVE-2025-5940

MEDIUM

Osom Blocks < 1.2.1 - Authenticated Stored Cross-Site Scripting via Class Name Parameter

Title source: llm

Description

The Osom Blocks – Custom Post Type listing block plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘class_name’ parameter in all versions up to, and including, 1.2.1 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.

References (4)

Core 4

Core References

https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3320673%40osomblocks&new=3320673%40osomblocks&sfp_email=&sfph_mail=

Product

https://plugins.trac.wordpress.org/browser/osomblocks/trunk/blocks/cpt-list/index.php#L171

Product

https://wordpress.org/plugins/osomblocks/#developers

Third Party Advisory

https://www.wordfence.com/threat-intel/vulnerabilities/id/54e022df-0dc7-4f60-811d-48a92b723d55?source=cve

Scores

CVSS v3 6.4

EPSS 0.0021

EPSS Percentile 10.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-79

Status published

Products (2)

osompress/Osom Blocks < 1.2.1

osompress/osom_blocks < 1.2.2

Published Jun 27, 2025

Tracked Since Feb 18, 2026