CVE-2025-0897 is a stored cross-site scripting vulnerability in the Modal Window – create popup modal window WordPress plugin by wpcalc. It affects all versions up to and including 6.1.5. The issue stems from improper neutralization of input in the 'iframeBox' shortcode, where user-supplied attributes are not properly sanitized or escaped. Authenticated attackers with contributor-level privileges or higher can exploit this to inject arbitrary JavaScript code that executes in the context of users visiting the compromised pages. The vulnerability 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, scope change, and limited confidentiality and integrity impact without availability impact. No known exploits in the wild have been reported. There is no vendor advisory or patch currently available.

An attacker with contributor-level or higher access can inject persistent malicious scripts into pages via the vulnerable shortcode. These scripts execute in the browsers of users who visit the affected pages, potentially leading to theft of session cookies, defacement, or other client-side impacts. The vulnerability affects confidentiality and integrity but does not impact availability. No known active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict contributor-level access to trusted users only and consider disabling or removing the vulnerable plugin if possible. Monitor official wpcalc communications for updates regarding patches or mitigations.