CVE-2026-1607 is a stored cross-site scripting vulnerability in the Surbma | Booking.com Shortcode WordPress plugin, affecting all versions up to 2.1. The vulnerability stems from improper neutralization of input during web page generation (CWE-79), specifically due to insufficient input sanitization and output escaping of user-supplied shortcode attributes. Authenticated attackers with contributor or higher privileges can inject arbitrary JavaScript that executes in the context of users viewing the injected pages. The CVSS 3.1 base score is 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 patch or official fix has been published, and no known exploits have been reported.

Successful exploitation allows authenticated users with contributor-level access or above to inject and store malicious scripts within pages using the vulnerable shortcode. These scripts execute in the browsers of users who view the infected pages, potentially leading to session hijacking, defacement, or other client-side impacts. The vulnerability affects confidentiality and integrity but does not impact availability. The scope is changed, meaning the vulnerability affects resources beyond the initially vulnerable component.

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 disabling or removing the Surbma | Booking.com Shortcode plugin if feasible. Monitor for updates from the vendor regarding patches or official mitigations.