The glomex oEmbed WordPress plugin suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. Specifically, the 'glomex_integration' shortcode does not properly sanitize or escape user-supplied attributes, allowing authenticated users with contributor-level privileges or higher to inject arbitrary scripts. These scripts execute in the context of any user who views the compromised page, potentially leading to session hijacking or other script-based attacks. The vulnerability affects all versions up to and including 0.9.1. 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, and partial confidentiality and integrity impact with no availability impact. No patch or vendor advisory is currently provided, and no exploits are known in the wild.

An authenticated attacker with contributor-level access or higher can inject malicious JavaScript into pages via the vulnerable shortcode. This script executes in the browsers of users who visit the infected pages, potentially compromising user sessions or performing unauthorized actions within the context of the affected site. The impact includes partial confidentiality and integrity loss but no availability impact. Since the vulnerability requires authenticated access, the risk is limited to environments where such user roles exist.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict contributor-level access to trusted users only and consider disabling or removing the glomex oEmbed plugin if possible. Monitor for updates from the vendor regarding patches or official mitigations.