CVE-2026-61982 in SiteGuard Plugin
Summary
by MITRE • 08/06/2026
Unauthenticated Cross Site Scripting (XSS) in SiteGuard WP Plugin <= 1.8.6 versions.
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Analysis
by VulDB Data Team • 08/06/2026
The vulnerability identified as unauthenticated cross site scripting in the SiteGuard WP plugin affects versions up to and including 1.8.6, representing a critical security weakness that allows attackers to execute malicious scripts in the context of a victim's browser without requiring authentication credentials. This type of vulnerability falls under the CWE-79 category known as "Cross-site Scripting" and specifically manifests as an unauthenticated attack vector where threat actors can exploit the plugin's failure to properly sanitize user input before rendering it within web pages.
The technical flaw exists in the plugin's handling of user-supplied data through parameters that are directly incorporated into HTML output without appropriate encoding or validation measures. Attackers can craft malicious payloads that, when processed by the vulnerable plugin, get executed in the browsers of unsuspecting users who visit affected pages. This typically occurs when the plugin fails to implement proper input sanitization mechanisms or output escaping routines for data originating from HTTP request parameters, cookies, or other user-controlled sources.
The operational impact of this vulnerability extends beyond simple script execution as it enables attackers to perform a wide range of malicious activities including session hijacking, credential theft through form scraping, redirection to malicious sites, defacement of web content, and potential privilege escalation within the compromised environment. The unauthenticated nature means that any user visiting a vulnerable site can be targeted, making this attack vector particularly dangerous as it requires no prior access or credentials to exploit. The vulnerability specifically affects WordPress installations using the SiteGuard plugin version 1.8.6 or earlier, creating a significant risk for website owners who have not updated their plugins.
Mitigation strategies should prioritize immediate plugin updates to versions that address this vulnerability, as developers typically release patches that implement proper input validation and output encoding mechanisms. Organizations should also consider implementing web application firewalls that can detect and block known XSS attack patterns, deploy content security policies to limit script execution capabilities, and conduct regular security audits of installed plugins to identify outdated or vulnerable components. Additionally, the vulnerability aligns with ATT&CK technique T1566.001 which describes social engineering via spearphishing attachments or links, as attackers can leverage this vulnerability to deliver malicious payloads through compromised websites. The remediation process must include verification that all plugin components have been properly updated and that no legacy code remains in the system that could potentially expose similar attack surfaces.