CVE-2026-2837 in Ricerca Plugin
Summary
by MITRE • 03/21/2026
The Ricerca – advanced search plugin for WordPress is vulnerable to Stored Cross-Site Scripting via plugin's settings in all versions up to, and including, 1.1.12 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
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Analysis
by VulDB Data Team • 03/21/2026
The vulnerability identified as CVE-2026-2837 affects the Ricerca – advanced search plugin for WordPress, representing a critical stored cross-site scripting flaw that undermines web application security. This vulnerability exists in all versions up to and including 1.1.12, making it a persistent threat across multiple plugin releases. The flaw stems from inadequate input sanitization and insufficient output escaping mechanisms within the plugin's administrative settings interface, creating a pathway for malicious code injection that can persist across user sessions and page visits.
The technical implementation of this vulnerability allows authenticated attackers who possess administrator-level permissions or higher to exploit the plugin's settings functionality to inject malicious scripts. These scripts become permanently stored within the plugin's configuration data and execute whenever users access pages that contain the injected content. The attack requires the attacker to have administrative privileges, which aligns with common privilege escalation patterns documented in cybersecurity frameworks such as the MITRE ATT&CK framework under the privilege escalation and persistence tactics. The vulnerability specifically targets multi-site WordPress installations where the unfiltered_html capability has been disabled, creating a unique attack surface that leverages the plugin's configuration management system rather than direct user input fields.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers to perform various malicious activities including session hijacking, data exfiltration, and further system compromise. The stored nature of the XSS vulnerability means that once exploited, the malicious scripts will execute automatically for any user who accesses affected pages, creating a persistent threat vector that can affect multiple users over time. This vulnerability type is classified under CWE-79 as "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", which specifically addresses the failure to properly sanitize user inputs before they are rendered in web pages. The impact is particularly severe in multi-site environments where a single compromised plugin can affect multiple individual sites within the network, amplifying the potential damage.
Mitigation strategies for this vulnerability should focus on immediate plugin updates to versions that address the sanitization and escaping flaws, combined with administrative access controls to limit the number of users with administrator privileges. Network monitoring should be enhanced to detect suspicious script injection patterns, and security audits should verify that all plugin configurations properly sanitize user inputs. The vulnerability also highlights the importance of implementing the principle of least privilege in WordPress environments, as demonstrated by the ATT&CK framework's emphasis on limiting administrative access to reduce attack surface. Organizations should also consider implementing content security policies to further protect against XSS attacks, and regularly audit their WordPress installations for similar input validation issues that may exist in other plugins or themes.