PT-2025-27066 · WordPress · Osom Blocks

Peter Thaleikis · CVE-2025-5940 · Published 2025-06-27 · Updated 2025-06-27

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: Osom Blocks – Custom Post Type listing block plugin for WordPress versions up to, and including, 1.2.1

Description: The issue is related to Stored Cross-Site Scripting via the class name parameter due to insufficient input sanitization and output escaping. This allows 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.

Recommendations: For versions up to, and including, 1.2.1, update to a version that addresses the insufficient input sanitization and output escaping issue. As a temporary workaround, consider restricting access to the class name parameter to minimize the risk of exploitation.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2025-5940

Affected Products

Osom Blocks

References · 9

• https://osv.dev/vulnerability/CVE-2025-5940 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-5940 · Security Note
• https://twitter.com/VulmonFeeds/status/1938533233840308689 · Twitter Post
• https://twitter.com/CVEnew/status/1938505221166035070 · Twitter Post
• https://t.me/cvenotify/126846 · Telegram Post
• https://wordfence.com/threat-intel/vulnerabilities/id/54e022df-0dc7-4f60-811d-48a92b723d55?source=cve · Note
• https://wordpress.org/plugins/osomblocks/#developers · Note
• https://plugins.trac.wordpress.org/browser/osomblocks/trunk/blocks/cpt-list/index.php#L171 · Note
• https://t.me/cvetracker/27220 · Telegram Post