Cacti Cacti — CVE-2026-39948 (Critical)

Summary

Cacti is an open source performance and fault management framework. In versions 1.2.30 and prior, the rfilter request parameter is retrieved via the raw accessor grv() (rather than gfrv() with FILTER_VALIDATE_IS_REGEX validation) and concatenated directly into RLIKE SQL clauses in lib/html_graph.php and lib/html_tree.php, which are reachable pre-authentication through graph_view.php on installations with guest graph viewing enabled. Because the unbalanced-quote payload bypasses the regex validation that would otherwise reject it, an unauthenticated attacker can inject arbitrary SQL to compromi

Why it matters

This CVE carries a CRITICAL severity rating (CVSS 9.8) in Cacti Cacti. Patch or mitigate promptly. EPSS percentile: 34%.

Operator check

Review CVE-2026-39948 in your asset inventory. Apply patches per vendor guidance and verify Cacti is not exposed. CVSS score: 9.8. EPSS probability: 0.4%; percentile: 34%.

Sources