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The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin for WordPress is vulnerable to reflected cross-site scripting (XSS) via filter parameters (e.g., filter_first_name) in all versions up to and including 2.11.1 due to insufficient input sanitization and output escaping. An unauthenticated attacker can supply a crafted request/URL containing a malicious script payload in a filter parameter, which is reflected into the response and executed in the victim’s browser when the victim loads the affected page (e.g., by clicking the crafted link).
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What an attacker gets, and what they’ve been doing with it.
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filter_* parameters (e.g., member directory/filter functionality) by limiting access to authenticated users where feasible. Implement WAF/reverse-proxy filtering to block or strip suspicious filter_* query parameters from unauthenticated requests and enable an XSS-focused ruleset to detect and block reflected script payloads.Patch, then assume compromise.
No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.