TI-2025-05366 Aliases CVE-2025-5940 GHSA-gc5x-2qxw-m6h5

Osom Blocks <= 1.2.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via class_name Parameter

LOW 28CWE-79Published 2025-06-27 · Updated 2026-04-08

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00254 17th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
osompress	Osom Blocks	up to 1.2.1	—	No fix listed	CNA

Osom Blocks Vendorosompress Affected up to 1.2.1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:osompress:osom_blocks::::::wordpress::*	before 1.2.2	Vulnerable	osompress

cpe:2.3:a:osompress:osom_blocks:*:*:*:*:*:wordpress:*:* Versions before 1.2.2 Vulnerable ·osompress

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2025-5940
2026-10-03 Alias added: GHSA-gc5x-2qxw-m6h5

References

Advisory 1

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

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences