CVE-2019-11185

CRITICAL

The WP Live Chat Support Pro plugin through 8.0.26 for WordPress contains an arbitrary file upload vulnerability. This results from an incomplete patch for CVE-2018-12426. Arbitrary file upload is achieved by using a non-blacklisted executable file extension in conjunction with a whitelisted file extension, and prepending "magic bytes" to the payload to pass MIME checks. Specifically, an unauthenticated remote user submits a crafted file upload POST request to the REST api remote_upload endpoint. The file contains data that will fool the plugin's MIME check into classifying it as an image (which is a whitelisted file extension) and finally a trailing .phtml file extension.

Published: Jun 3, 2019 Modified: Jun 17, 2026

CWE-434

CVSS Metrics

CVSSv3

Attack Vector: NETWORK Attack Complexity: LOW Privileges Required: NONE User Interaction: NONE Scope: UNCHANGED Confidentiality Impact: HIGH Integrity Impact: HIGH Availability Impact: HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Products (1)

Vendor	Product	Version
3cx	live_chat	* < 8.0.26

GitHub Security Advisory GHSA-wfph-5jh4-c99x

The WP Live Chat Support Pro plugin through 8.0.26 for WordPress contains an arbitrary file...

References (6)

https://wordpress.org/plugins/wp-live-chat-support/#developers Third Party Advisory
https://wp-livechat.com/ Vendor Advisory
https://wpvulndb.com/vulnerabilities/9320 Exploit, Third Party Advisory
https://wordpress.org/plugins/wp-live-chat-support/#developers Third Party Advisory
https://wp-livechat.com/ Vendor Advisory
https://wpvulndb.com/vulnerabilities/9320 Exploit, Third Party Advisory

Risk Scores

CVSS Score 9.8 / 10

EPSS Score 4.35%

Top 10% most likely to be exploited

Threat Score 40.5 / 100

Data Sources

NVD EPSS GitHub