CVE-2025-4611

MEDIUM

Slim SEO - Fast & Automated WordPress SEO Plugin <4.5.3 - XSS

Title source: llm

Description

The Slim SEO – Fast & Automated WordPress SEO Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's slim_seo_breadcrumbs shortcode in all versions up to, and including, 4.5.3 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.

Exploits (1)

nomisec WRITEUP

by x6vrn · poc

https://github.com/x6vrn/CVE-2025-4611-PoC

View Code ZIP pw:eip

References (7)

[Product] https://plugins.trac.wordpress.org/browser/slim-seo/tags/4.5.3/src/Breadcrumbs.php#L37

[Product] https://plugins.trac.wordpress.org/browser/slim-seo/tags/4.5.3/src/Breadcrumbs.php#L85

[Product] https://wordpress.org/plugins/slim-seo/#developers

[Product] https://plugins.trac.wordpress.org/browser/slim-seo/tags/4.5.3/src/Breadcrumbs.php#L109

[Product] https://plugins.trac.wordpress.org/changeset/3296099/

[Third Party Advisory] https://www.wordfence.com/threat-intel/vulnerabilities/id/6318a1cf-716f-450c-a1c2-497de8095daa?source=cve

[Patch] https://github.com/elightup/slim-seo/commit/b475dceff3a6bd94335d5a79eb12cdd92e2c8350

Scores

CVSS v3 6.4

EPSS 0.0008

EPSS Percentile 23.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-79

Status published

Products (2)

rilwis/Slim SEO – A Fast & Automated SEO Plugin For WordPress < 4.5.3

rilwis/Slim SEO – Fast & Automated WordPress SEO Plugin < 4.5.3

Published May 21, 2025

Tracked Since Feb 18, 2026