CVE-2023-28933: 
WordPress vulnerability analysis and mitigation

A Stored Cross-Site Scripting (XSS) vulnerability was discovered in the StPeteDesign Call Now Accessibility Button WordPress plugin versions 1.1 and below. The vulnerability was identified on March 28, 2023, and publicly disclosed on June 2, 2023. This security issue affects administrators and users with high privileges in WordPress installations (Patchstack).

The vulnerability stems from improper sanitization and escaping of certain plugin settings. This security flaw could be exploited even when the unfiltered_html capability is disallowed, such as in multisite setups. The vulnerability has been assigned a CVSS v3.1 base score of 4.8 (Medium) by NIST with a vector string of CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N, while Patchstack assessed it with a score of 5.9 (Medium). The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation) (NVD, WPScan).

The vulnerability allows malicious actors with administrative privileges to inject malicious scripts, including redirects, advertisements, and other HTML payloads into the website. These injected scripts would then be executed when guests visit the affected site (Patchstack).

The vulnerability has been patched in version 1.2 of the Call Now Accessibility Button plugin. Site administrators are advised to update to version 1.2 or later to remove the vulnerability. It's worth noting that the software appears to be abandoned, as it hasn't been updated for over a year, and users should consider replacing it with an alternative solution (Patchstack).