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Published: 23/11/2020 Updated: 03/12/2020

CVSS v2 Base Score: 3.5 | Impact Score: 2.9 | Exploitability Score: 6.8

CVSS v3 Base Score: 5.4 | Impact Score: 2.7 | Exploitability Score: 2.3

VMScore: 312

Vector: AV:N/AC:M/Au:S/C:N/I:P/A:N

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.

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CWE-79 https://github.com/ScratchAddons/ScratchAddons/releases/tag/v1.3.2 https://github.com/ScratchAddons/ScratchAddons/commit/b9a52d6532c8514254c7cc1d8e18710dbedc41ff https://github.com/ScratchAddons/ScratchAddons/security/advisories/GHSA-6qfq-px3r-xj4p https://github.com/ScratchAddons/ScratchAddons/blob/a471893df403f86c9182970678175d4772a0690c/addons/more-links/userscript.js#L15 https://nvd.nist.gov

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CVE-2020-26239

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