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 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.

EPSS: 0.002 (11.1th 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.