CVE-2026-1807 is a stored cross-site scripting (XSS) vulnerability identified in the InteractiveCalculator for WordPress plugin, specifically in versions up to and including 1.0.3. The vulnerability arises from improper neutralization of user-supplied input within the plugin's 'interactivecalculator' shortcode attributes. Because the plugin fails to adequately sanitize and escape these inputs, authenticated users with contributor-level permissions or higher can inject arbitrary JavaScript code into pages or posts. This malicious code is stored persistently and executed whenever any user accesses the compromised page, enabling attacks such as session hijacking, defacement, or unauthorized actions performed in the context of the victim's browser session. The vulnerability is classified under CWE-79, indicating improper input neutralization during web page generation. The CVSS v3.1 base score is 6.4, reflecting a medium severity level, with an attack vector of network (remote exploitation), low attack complexity, requiring privileges (contributor or higher), no user interaction, and a scope change due to potential impact beyond the vulnerable component. No patches or updates are currently linked, and no active exploits have been reported. The vulnerability's persistence and ability to affect multiple users make it a significant concern for WordPress sites using this plugin, particularly those with multiple content contributors.

For European organizations, this vulnerability poses a moderate risk primarily to websites and web applications running WordPress with the InteractiveCalculator plugin installed. The ability for contributors to inject persistent malicious scripts can lead to unauthorized access to user sessions, theft of sensitive information, or manipulation of site content, undermining trust and potentially causing reputational damage. Organizations relying on WordPress for public-facing websites or internal portals with multiple content editors are especially vulnerable. The exploitation could facilitate further attacks such as phishing, malware distribution, or privilege escalation within the site. Given the medium CVSS score and the requirement for contributor-level access, the threat is more significant in environments with less stringent access controls or where contributor roles are widely assigned. Additionally, the scope change indicates that the impact could extend beyond the immediate plugin, affecting other site components or users. The lack of known exploits in the wild reduces immediate urgency but does not diminish the need for proactive mitigation.

1. Immediately audit and restrict contributor-level access to trusted users only, minimizing the number of accounts that can exploit this vulnerability. 2. Implement strict input validation and output encoding for all shortcode attributes, either by updating the plugin if a patch becomes available or by applying custom code filters to sanitize inputs. 3. Monitor WordPress logs and content changes for suspicious shortcode usage or unexpected script injections. 4. Educate content contributors about the risks of injecting untrusted content and enforce content submission policies. 5. Consider disabling or removing the InteractiveCalculator plugin if it is not essential, or replace it with a more secure alternative. 6. Employ web application firewalls (WAFs) with rules targeting XSS payloads in shortcode parameters to block exploitation attempts. 7. Regularly update WordPress core, plugins, and themes to incorporate security fixes as they become available. 8. Conduct periodic security assessments and penetration testing focused on user input handling and privilege management.