The vulnerability identified as CVE-2025-31891 affects the Gosign – Posts Slider Block plugin (version <= 1.1.0). It is a stored cross-site scripting (XSS) issue caused by improper neutralization of input during web page generation. This flaw allows an attacker with low privileges and requiring user interaction to inject malicious scripts that execute in the context of other users, potentially leading to partial confidentiality, integrity, and availability impacts. The CVSS 3.1 base score is 6.5 (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L), reflecting network attack vector, low attack complexity, low privileges required, user interaction needed, scope change, and low impact on confidentiality, integrity, and availability.

Successful exploitation of this stored XSS vulnerability could allow an attacker to execute arbitrary scripts in the context of other users, potentially leading to partial compromise of confidentiality, integrity, and availability of the affected system or user data. The attack requires low privileges and user interaction but can affect users beyond the attacker’s scope due to the scope change indicated in the CVSS vector. There are no known exploits in the wild currently.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor the vendor's communications for updates. Until a fix is available, consider restricting access to the affected plugin or disabling it if feasible to reduce exposure.