WAF - WAF Release - 2026-10-01 - Emergency

<p>This update provides immediate defense against a vulnerability affecting Citrix NetScaler ADC and Gateway appliances, deploying protection against improper input validation vectors.</p> <p><strong>Key Findings</strong></p> <ul> <li>CVE-2026-88771: An improper input validation vulnerability affecting Citrix NetScaler ADC and Gateway allows an unauthenticated attacker to execute arbitrary commands.</li> </ul> <p><strong>Impact</strong></p> <p>We strongly recommend that administrators apply the latest versions to fully secure origin servers. Additionally, customers should review configurations against applicable preconditions and follow standard incident response processes if signs of compromise are identified.</p> <p>Detailed Rule Changes</p> <table style="width: 100%"><thead><tr><th>Ruleset</th><th>Rule ID</th><th>Legacy Rule ID</th><th>Description</th><th>Previous Action</th><th>New Action</th><th>Comments</th></tr></thead><tbody><tr><td>Cloudflare Managed Ruleset</td><td><span class="rule-id" data-rule-id="6802845374ea41a289fd4f43827ab216"><button type="button" title="Copy rule ID" aria-label="Copy rule ID 6802845374ea41a289fd4f43827ab216" class="border-border bg-muted hover:border-foreground/30 hover:bg-accent inline-flex cursor-copy items-center rounded-md border px-1.5 py-0.5 transition-colors duration-150"><span class="font-mono text-[0.8125rem] font-medium">...827ab216</span></button></span></td><td>N/A</td><td>Citrix Netscaler ADC and Gateway - Improper input validation - CVE:CVE-2026-88771</td><td>N/A</td><td>Block</td><td>This is a new detection.</td></tr></tbody></table>