CVE-2025-63709: simple to-do list XSS — Exploit

Description

A Cross-Site Scripting (XSS) vulnerability exists in SourceCodester Simple To-Do List System 1.0 in the "Add Tasks" text input. An authenticated user can submit HTML/JavaScript that is not correctly sanitized or encoded on output. The injected script is stored and later rendered in the browser of any user who views the task, allowing execution of arbitrary script in the context of the victim's browser.

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CVSS v3.1 Score

5.4

MEDIUM

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

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
chuck24	simple_to-do_list_system	All

References

Exploits

https://github.com/floccocam-cpu/CVE-Research-2025/tree/main/CVE-2025-63709

Other References

https://www.sourcecodester.com/php/17897/simple-do-list-system-using-php.html

Frequently Asked Questions

What is CVE-2025-63709? +

A Cross-Site Scripting (XSS) vulnerability exists in SourceCodester Simple To-Do List System 1.0 in the "Add Tasks" text input. An authenticated user can submit HTML/JavaScript that is not correctly sanitized or encoded on output. The injected script is stored and later rendered in the browser of any user who views the task, allowing execution of arbitrary script in the context of the victim's browser. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2025-63709? +

CVE-2025-63709 has a CVSS v3.1 score of 5.4 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-2025-63709? +

CVE-2025-63709 affects products from chuck24, specifically: simple_to-do_list_system. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-63709? +

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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