Customer Advisory: Critical PHP Vulnerabilities (CVE-2026-109618 and CVE-2026-109619)
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Customer Advisory: Critical PHP Vulnerabilities (CVE-2026-109618 and CVE-2026-109619)

Vulnerabilities

Summary
On 21 October 2026, the PHP project released emergency security updates for two critical vulnerabilities, CVE-2026-109618 and CVE-2026-109619. Both are rated 9.2 (Critical) on CVSS v4 and could allow an unauthenticated attacker to execute code remotely with the privileges of the web worker. PHP has reported that working exploits were developed during its research, and it considers Apache mod_php installations the highest risk. Fixes are available in PHP 8.5.12, 8.4.27, 8.3.36 and 8.2.35.
On 23 October 2026, the PHP project released details regarding a new vulnerability classified as CVE-2026-115560.

Our position
Mimecast has reviewed its product portfolio for exposure to these three vulnerabilities. Our review has confirmed that no Mimecast products or services are currently affected and no action is required from customers.

Product status
DMARC Analyzer 1.0: Mitigations applied
All other Mimecast products and services: Not affected