CVE-2026-5506 is a stored cross-site scripting vulnerability in the Wavr WordPress plugin (versions up to 0.2.6). It occurs due to improper neutralization of input in the 'wave' shortcode, where user-supplied attributes are not adequately sanitized or escaped. This allows authenticated users with contributor or higher privileges to inject arbitrary JavaScript code that executes in the context of any user viewing the compromised page. The vulnerability is classified under CWE-79 and has a CVSS 3.1 base score of 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N), reflecting network attack vector, low attack complexity, required privileges, no user interaction, and partial impact on confidentiality and integrity without affecting availability.

An attacker with contributor-level access or higher can inject persistent malicious scripts into pages via the vulnerable shortcode. These scripts execute in the browsers of users who visit the infected pages, potentially leading to theft of user credentials, session tokens, or other sensitive information. The vulnerability impacts confidentiality and integrity but does not affect availability. There are no reports of active exploitation in the wild.

No official patch or remediation is currently available for this vulnerability. Users should monitor the vendor's advisory channels for updates. As a temporary mitigation, restrict contributor-level access to trusted users only and consider disabling or removing the Wavr plugin until a fix is released. Avoid using the vulnerable shortcode with untrusted input. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.