Information
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Advisory by Netsparker (now Invicti)
Name: Multiple XSS Vulnerabilities in BulletProof Security
Affected Software: BulletProof Security
Affected Versions: v53.3 and possibly below
Vendor Homepage: https://wordpress.org/plugins/bulletproof-security/  
Vulnerability Type: Cross-site Scripting
Severity: Important
Status: Fixed
Invicti Advisory Reference: NS-16-004

Technical Details
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Proof of Concept URLs for XSS vulnerabilities in BulletProof Security v53.3:

URL /wordpress/wp-admin/admin.php?page=bulletproof-security/admin/security-log/security-log.php
Parameter Name user-agent-ignore
Parameter Type POST
Attack Pattern '"--></style></scRipt><scRipt>alert(0x001E32)</scRipt>

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

Advisory Timeline
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15 Mar 2016 - First Contact
23 Mar 2016 - Vendor Fixed
09 May 2016 - Advisory Released

Solution
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Patch released by BulletProof Security and announced here.

Credits & Authors
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These issues have been discovered by Omar Kurt 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.