CVE-2025-63785: onlook Input Validation Flaw — Exploit

Description

A DOM-based Cross-Site Scripting (XSS) vulnerability exists in the text editor feature of the Onlook web application 0.2.32. This vulnerability occurs because user-supplied input is not properly sanitized before being directly injected into the DOM via innerHTML when editing a text element. An attacker can exploit this to inject malicious HTML and script code, which is then executed within the context of the preview iframe, allowing for the execution of arbitrary scripts in the user's session.

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CVSS v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness Type (CWE)

CWE-20 Improper Input Validation

CWE-79 Cross-site Scripting (XSS)

CWE-116 CWE-116

Affected Products

Vendor	Product	Versions
onlook	onlook	All

References

Exploits

https://blog.soohyun.tech/CVE-2025-63785-DOM-XSS-in-Onlook-27e557175d2e80e1b210c75b77952115

Other References

https://tossbank.notion.site/DOM-XSS-in-onlook-27e557175d2e80e1b210c75b77952115

Frequently Asked Questions

What is CVE-2025-63785? +

A DOM-based Cross-Site Scripting (XSS) vulnerability exists in the text editor feature of the Onlook web application 0.2.32. This vulnerability occurs because user-supplied input is not properly sanitized before being directly injected into the DOM via innerHTML when editing a text element. An attacker can exploit this to inject malicious HTML and script code, which is then executed within the context of the preview iframe, allowing for the execution of arbitrary scripts in the user's session. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2025-63785? +

CVE-2025-63785 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-63785? +

CVE-2025-63785 affects products from onlook, specifically: onlook. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-63785? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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