#VU29207 Stored cross-site scripting in tui-editor

Vulnerability identifier: #VU29207

Vulnerability risk: Low

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
tui-editor
Web applications / Modules and components for CMS

Vendor: NHN Corp

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in "firstLine" When used in WYSIWYG only mode. A remote attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

tui-editor: 0.0.1 - 2.1.2

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External links
https://snyk.io/vuln/SNYK-JS-TUIEDITOR-571463
https://github.com/nhn/tui.editor/issues/1021
https://github.com/nhn/tui.editor/pull/1022
https://github.com/nhn/tui.editor/blob/master/apps/editor/src/js/wwCodeBlockManager.js#L354

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.