Information
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Advisory by Netsparker (now Invicti)
Name: Reflected Cross-site Scripting Vulnerability in BigTree CMS
Affected Software: BigTree CMS
Affected Versions: 4.2.23
Homepage: https://www.bigtreecms.org/
Vulnerability: Cross-site Scripting
Severity: High
Status: Fixed
CVSS Score (3.0): AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Invicti Advisory Reference: NS-18-016

Technical Details
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URL  : /index.php/admin/quotes/edit/process/  
Parameter Name  : id
Parameter Type  : POST
Attack Pattern  : x"+onmouseover=netsparker(0x00AB9D)+x="

For more information on cross-site scripting vulnerabilities read the article Cross-site Scripting (XSS).

Advisory Timeline
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24th October 2018 - First Contact
24th October 2018 - Vendor Fixed
26th October 2018 - Advisory Released

Credits & Authors
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These issues have been discovered by Mithat Gogebakan while testing Invicti Web Application Security Scanner.

About Invicti
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Invicti Security is transforming the way web applications are secured. Invicti empowers organizations in every industry to scale their overall security operations, make the best use of their security resources, and engage developers in helping to improve their overall security posture.