CVE-2026-1851 is a stored cross-site scripting vulnerability in the deckercz iVysilani Shortcode WordPress plugin. The flaw exists in the handling of the 'width' shortcode attribute, where input is not properly sanitized or escaped before being rendered on pages. Authenticated attackers with Contributor-level privileges or higher can exploit this to inject malicious scripts that execute in the context of users viewing the compromised pages. This vulnerability affects all versions up to 3.0 of the plugin. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, privileges required, no user interaction, and impacts on confidentiality and integrity with no availability impact.

An attacker with Contributor-level access or higher can inject persistent malicious scripts into WordPress pages via the vulnerable shortcode attribute. This can lead to unauthorized actions performed in the context of users viewing the infected pages, potentially compromising user data confidentiality and integrity. There is no indication of impact on system availability. No known exploits in the wild have been reported at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict Contributor-level access to trusted users only and consider removing or disabling the iVysilani Shortcode plugin if possible. Monitor official sources for updates and apply patches promptly once released.