CVE-2026-1822 describes a stored cross-site scripting vulnerability in the WP NG Weather plugin for WordPress, affecting all versions up to 1.0.9. The issue is due to improper neutralization of input during web page generation, specifically in the 'ng-weather' shortcode, where user-supplied attributes are not properly sanitized or escaped. This allows authenticated users with contributor or higher privileges to inject arbitrary JavaScript code that executes in the context of other users viewing the injected pages. The vulnerability is rated medium severity with a CVSS 3.1 score of 6.4, reflecting network attack vector, low attack complexity, and privileges required at the contributor level.

Successful exploitation allows an authenticated contributor or higher to inject persistent malicious scripts into pages via the 'ng-weather' shortcode. These scripts execute in the browsers of users who view the affected pages, potentially leading to information disclosure or session hijacking limited to the scope of the injected script. There is no indication of direct denial of service or system-level compromise. No known active exploitation has been reported.

No official patch or fix is currently available for this vulnerability. Users should monitor the vendor's advisory channels for updates. Until a fix is released, restrict contributor-level access to trusted users only and consider disabling or removing the WP NG Weather plugin if possible to prevent exploitation. Applying strict input validation or output escaping at the application level may mitigate risk but requires custom development.