CVE-2025-0863: Flexmls® IDX <= 3.14.27 - Authenticated (Contributor+) Stored Cross-Site Scripting

Severity: medium (CVSS 6.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-03-07 · updated 2026-06-17
Weakness: CWE-79

Description

The Flexmls® IDX Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'idx_frame' shortcode in all versions up to, and including, 3.14.27 due to insufficient input sanitization and output escaping on user supplied attributes. 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.

Affected products

Flexmls® IDX Plugin: through 3.14.28

References

https://plugins.trac.wordpress.org/browser/flexmls-idx/tags/3.14.25/flexmls_connect.php#L92
https://plugins.trac.wordpress.org/browser/flexmls-idx/tags/3.14.25/lib/base.php#L220
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3251292%40flexmls-idx&new=3251292%40flexmls-idx&sfp_email=&sfph_mail=
https://www.wordfence.com/threat-intel/vulnerabilities/id/1c8e814b-3828-4b3f-a9ad-b3758ab9b109?source=cve

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