LightCMS 1.3.4 exclusive Stored XSS

2021.03.06

Credit: Peithon

Risk: Low

Local: No

Remote: Yes

CVE: CVE-2021-3355

CWE: CWE-79

CVSS Base Score: 3.5/10

Impact Subscore: 2.9/10

Exploitability Subscore: 6.8/10

Exploit range: Remote

Attack complexity: Medium

Authentication: Single time

Confidentiality impact: None

Integrity impact: Partial

Availability impact: None

# 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.

See this note in RAW Version

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LightCMS 1.3.4 exclusive Stored XSS

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