The vulnerability CVE-2025-26923 in Bastien Ho Event post plugin allows stored cross-site scripting due to improper input neutralization during web page generation. This enables an attacker with low privileges to inject malicious scripts that are stored and later executed in the context of other users viewing the affected pages. The issue affects all versions up to 5.9.8. The CVSS 3.1 vector indicates network attack vector, low attack complexity, low privileges required, user interaction required, and a scope change with low impact on confidentiality, integrity, and availability.

Successful exploitation can lead to execution of arbitrary scripts in the context of other users, potentially allowing theft of user credentials, session tokens, or performing actions on behalf of the user. The impact is rated medium due to the limited scope and requirement for user interaction and low privileges. There are no reports of active exploitation in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider disabling or restricting use of the Event post plugin to mitigate risk. Implementing web application firewalls (WAF) with XSS filtering may provide temporary protection. Monitor vendor channels for updates and apply patches promptly once released.