The Telefication WordPress plugin is vulnerable to Open Proxy and Server-Side Request Forgery via the ~/bypass.php file due to a user-supplied URL request value that gets called by a curl requests. This affects versions up to, and including, 1.8.0.
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39339
https://plugins.trac.wordpress.org/browser/telefication/tags/1.8.0/bypass.php
Source: Mitre, NVD
Published: 2021-09-22
Updated: 2026-06-17
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
Severity: Medium
Base Score: 5.3
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS: 0.00216