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LightCMS 1.3.4 Cross Site Scripting

LightCMS 1.3.4 Cross Site Scripting
Posted Feb 26, 2021
Authored by Peithon

LightCMS version 1.3.4 suffers from a persistent cross site scripting vulnerability.

tags | exploit, xss
advisories | CVE-2021-3355
SHA-256 | 489d6c40243ba53c59b2924a4df63135bfe4159984831d388fdfb908bf301091

LightCMS 1.3.4 Cross Site Scripting

Change Mirror Download
# Exploit Title: LightCMS 1.3.4 - 'exclusive' Stored XSS
# Date: 25/02/2021
# Exploit Author: Peithon
# Vendor Homepage: https://github.com/eddy8/LightCMS
# Software Link: https://github.com/eddy8/LightCMS/releases/tag/v1.3.4
# Version: 1.3.4
# Tested on: latest version of Chrome, Firefox on Windows and Linux
# CVE: CVE-2021-3355

An issue was discovered in LightCMS v1.3.4.(https://github.com/eddy8/LightCMS/issues/18) There is a stored-self XSS, allowing an attacker to execute HTML or JavaScript code in a vulnerable Title field to /admin/SensitiveWords.

--------------------------Proof of Concept-----------------------

1. Log in to the background.

2. Navigate to System -> `/admin/SensitiveWords/create` & add the below-shared payload as the exclusive field value. Payload - </span><img src=1 onerror=alert(1) /><span>

3. Visit page `/admin/SensitiveWords`, the payload will be triggered.

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