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The Smart Maintenance Mode WordPress plugin before version 1.5.2 contains a stored Cross-Site Scripting (XSS) vulnerability. The vulnerability was discovered and disclosed on March 3, 2025, and affects the plugin's settings functionality (WPScan, NVD).
The vulnerability stems from improper sanitization and escaping of certain plugin settings. This security flaw exists even when the unfiltered_html capability is disallowed, such as in multisite setups. The vulnerability has been assigned a CVSS v3.1 base score of 6.1 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N (NVD).
When exploited, this vulnerability allows high-privilege users such as administrators to perform Stored Cross-Site Scripting attacks. The impact is particularly notable in multisite setups where even with restricted HTML filtering, attackers can still inject malicious scripts (WPScan).
The vulnerability has been patched in version 1.5.2 of the Smart Maintenance Mode plugin. Users are advised to update to this version or later to mitigate the security risk (WPScan).
Source: This report was generated using AI
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