CVE-2026-15292 is a stored Cross-Site Scripting vulnerability in the Sudoku Shortcode WordPress plugin (tibouille) affecting all versions up to and including 1.0.0. The vulnerability is due to improper neutralization of input (CWE-79) in the 'background' parameter of the 'sudoku-sc' shortcode, allowing authenticated users with Contributor-level permissions or higher to inject arbitrary web scripts. These scripts execute in the context of any user accessing the injected page, potentially leading to information disclosure or session hijacking. No official patch or remediation level has been published as of now, and no known exploits are reported in the wild.

An attacker with Contributor-level or higher access can inject malicious JavaScript code via the 'background' parameter, which will be stored and executed in the browsers of users who visit the affected pages. This can lead to partial confidentiality and integrity loss (e.g., theft of cookies or manipulation of page content). There is no impact on availability reported. The vulnerability requires authenticated access and does not require user interaction to trigger once the malicious content is stored.

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 Sudoku Shortcode plugin if possible. Monitor vendor channels for updates or patches addressing this vulnerability.