The Flexmls® IDX plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 3.14.27 via deserialization of untrusted input. This makes it possible for unauthenticated attackers to inject a PHP Object. No known POP chain is present in the vulnerable software. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.
CVE-2025-26900 is a critical severity with CVSS 9.8 Vulnerability issue affecting the Plugin Flexmls® IDX Plugin. It affects Versions up to 3.14.27 and is fixed in 3.14.28.
CVE-2025-26900 is tracked for the Plugin Flexmls® IDX Plugin as critical severity with CVSS 9.8. The affected range is Versions up to 3.14.27. Update Flexmls® IDX Plugin to 3.14.28 or newer where that version is compatible with the site.
| Software Type | Plugin |
|---|---|
| Software Slug |
flexmls-idx
View on wordpress.org
|
| CVE | CVE-2025-26900 |
| Patched Versions |
3.14.28
|
| Affected Versions |
Versions up to 3.14.27
|
These internal links group the same WordPress plugin by CVE, issue type, severity, and patch status so operators and search engines can connect the full vulnerability cluster.
Flexmls® IDX <= 3.14.27 - Authenticated (Contributor+) Stored Cross-Site Scripting
Flexmls® IDX Plugin <= 3.14.26 - Authenticated (Contributor+) Stored Cross-Site Scripting via API parameters
Flexmls® IDX Plugin <= 3.15.9 - Reflected Cross-Site Scripting
Flexmls® IDX Plugin <= 3.14.22 - Reflected Cross-Site Scripting
Flexmls® IDX <= 3.15.7 - Unauthenticated Open Redirect
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