CVE-2026-4089 is a stored cross-site scripting vulnerability in the Twittee Text Tweet plugin for WordPress, affecting all versions up to 1.0.8. The vulnerability arises because the plugin's ttt_twittee_tweeter() function uses extract() to assign shortcode attributes to local variables and then directly concatenates these variables into HTML output without escaping. Specifically, the 'id' attribute is inserted into an HTML id attribute without esc_attr(), enabling attackers to break out of the attribute context and inject arbitrary HTML event handlers. Additionally, the 'tweet', 'content', 'balloon', and 'theme' attributes are injected into inline JavaScript without escaping, further increasing the risk of script injection. Exploitation requires authenticated access at Contributor level or above, allowing persistent script injection that executes when other users access the compromised page.

Successful exploitation allows an authenticated user with Contributor-level permissions or higher to inject arbitrary JavaScript code into pages rendered by the plugin. This can lead to cross-site scripting attacks affecting site visitors and administrators, potentially resulting in session hijacking, defacement, or other malicious actions executed in the context of the vulnerable site. The vulnerability does not impact availability but compromises confidentiality and integrity to a limited extent as indicated by the CVSS vector (C:L/I:L/A:N). There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, site administrators should consider restricting Contributor-level access or disabling the Twittee Text Tweet plugin to prevent exploitation. Applying strict input validation or output escaping via custom code or security plugins may mitigate risk but is not a substitute for an official patch. Monitor vendor channels for updates and apply patches promptly once available.