CVE-2026-8888: Securly

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Version 3.0.7 of the Securly Chrome Extension downloads config.json over HTTP and compiles server-provided patterns as JavaScript regular expressions via new RegExp() without complexity validation. An on-path attacker can inject specific patterns to cause catastrophic backtracking, resulting in denial of service on all browsing.

Affected products

• Securly Securly: version 3.0.7 only

Published 2026-06-03. Last modified 2026-07-22.