What is CVE-2025-8621?

CVE-2025-8621 is a medium-severity vulnerability in Odn Mosaic Generator, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 6.4/10. Published 2025-08-12.

How severe is CVE-2025-8621?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Is CVE-2025-8621 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Odn Mosaic Generator

CVE-2025-8621

The Mosaic Generator plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘c’ parameter in all versions up to, and including, 1.0.5 due to insufficient input sanitization and output escaping. This makes it possible for…

EPSS: 0.002 (9.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Odn Mosaic Generator — versions 0

Weakness classification (CWE)

CWE-80 — Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

Frequently asked questions

What is CVE-2025-8621?: CVE-2025-8621 is a medium-severity vulnerability in Odn Mosaic Generator, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 6.4/10. Published 2025-08-12.
How severe is CVE-2025-8621?: Medium severity. CVSS v3 base score is 6.4 out of 10.
Is CVE-2025-8621 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.