CVE-2019-18653

A Cross Site Scripting (XSS) issue exists in Avast AntiVirus (Free, Internet Security, and...

6.1 Medium

A Cross Site Scripting (XSS) issue exists in Avast AntiVirus (Free, Internet Security, and Premiere Edition) 19.3.2369 build 19.3.4241.440 in the Network Notification Popup, allowing an attacker to execute JavaScript code via an SSID Name.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

0.85%Down 5.8 points since Apr 14, 2021

What each source reports

NVD Score used 6.1

Record: CVE-2019-18653
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Record: CVE-2019-18653
Updated: 2026-11-02

EUVDEUVD-2019-8372 No score

Record: EUVD-2019-8372
Updated: 2026-11-03

GitHub AdvisoriesGHSA-c7cg-5x5v-hrhj 6.1

A Cross Site Scripting (XSS) issue exists in Avast AntiVirus (Free, Internet Security, and...

Record: GHSA-c7cg-5x5v-hrhj
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

Affected products

avast antivirus

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-18653 is a medium vulnerability (CVSS 6.1) in Avast Antivirus, published November 1, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.85%, the 58th percentile. No source names a fixed version.