CVE-2026-78293: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in axew3 WP w3all phpBB

This vulnerability (CVE-2026-78293) affects WP w3all phpBB versions <= 3.0.6 and is classified as CWE-79, indicating improper neutralization of input during web page generation leading to cross-site scripting (XSS). The flaw allows unauthenticated attackers to inject malicious scripts that can execute in the context of other users, potentially leading to information disclosure, session hijacking, or other impacts. The CVSS 3.1 base score is 7.1 (high), reflecting network attack vector, low attack complexity, no privileges required, user interaction required, and impacts to confidentiality, integrity, and availability. No patch or official remediation level has been published yet.

Successful exploitation can lead to execution of arbitrary scripts in the context of users visiting the vulnerable phpBB instance, potentially resulting in information disclosure, session hijacking, or other malicious actions impacting confidentiality, integrity, and availability. The vulnerability is exploitable remotely without authentication but requires user interaction.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, consider applying web application firewall (WAF) rules to detect and block XSS payloads targeting this product. Monitor vendor channels for updates and apply official fixes once released.