CVE-2020-26239CWE-79

Cross-Site Scripting in Scratch browser addons

High · published November 23, 2020

CVSS v3.1
7.6
EPSS
1%
Percentile
63.3
In the wild
Unconfirmed
What it is

Scratch Addons is a WebExtension that supports both Chrome and Firefox. Scratch Addons before version 1.3.2 is vulnerable to DOM-based XSS. If the victim visited a specific website, the More Links addon of the Scratch Addons extension used incorrect regular expression which caused the HTML-escaped values to be unescaped, leading to XSS. Scratch Addons version 1.3.2 fixes the bug. The extension will be automatically updated by the browser. More Links addon can be disabled via the option of the extension.

The record
Technical detail
CVSS v3.1
7.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.01028 · 63.3th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2020-11-23T19:05Z
EPSS history
Timeline
  • 23 NOV 19:05Z
    Cross-Site Scripting in Scratch browser addons
    cvelistv5