CVE-2024-6864 is a stored cross-site scripting vulnerability in the WP Last Modified Info plugin for WordPress, affecting all versions up to 1.9.0. The issue is due to improper neutralization of input in the 'template' attribute of the lmt-post-modified-info shortcode, allowing authenticated users with Contributor or higher privileges to inject arbitrary web scripts. These scripts execute in the context of users viewing the injected pages, potentially leading to information disclosure or session hijacking. The vulnerability is classified under CWE-79 and has a CVSS 3.1 base score of 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N).

An attacker with Contributor-level or higher access can exploit this vulnerability to inject persistent malicious scripts into pages using the vulnerable shortcode attribute. This can lead to limited confidentiality and integrity impacts, such as theft of user session data or modification of page content when viewed by other users. There is no direct availability impact. No known exploits in the wild have been reported.

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 disabling or removing the WP Last Modified Info plugin if feasible. Monitor official vendor channels for updates and apply patches promptly once released.