Responding to core PHP vulnerabilities CVE-2026-109618 and CVE-2026-109619
MentionsGoogleGoogle Cloud
Editor's note : This blog was updated on Oct. 23, 2026 at 3:20 p.m. PDT, with additional guidance from Mandiant Consulting on monitoring, patching, and remediation. We have previously updated the blog on Oct. 22, 2026, with revised guidance for Security Command Center and Cloud Armor, and on Oct. 21, 2026 .
Summary from Google Cloud Security.
Explained
The technology and terms in this story. Learn more
- TechnologyPHPA programming language that powers a large share of websites, including WordPress.
- AttackRemote code execution · RCEA flaw that lets an attacker run their own code on someone else's machine over the network.
- ConceptCVE · Common Vulnerabilities and ExposuresThe public ID system for vulnerabilities, such as CVE-2026-12345, so everyone means the same bug.
- ConceptExploitCode or a technique that turns a software flaw into something an attacker can actually use.
Why it was possible
The weaknesses behind this story's CVEs, from each CVE Record.
Vulnerabilities in this story
Severity and exploitation facts from NVD, FIRST, and CISA.
Related coverage
Other sources covering the same vulnerabilities or event.
SANS Stormcast Thursday, October 22nd, 2026: Critical PHP RCE Vulnerabilities Exploited (CVE-2026-109618, CVE-2026-109619); Fortinet AI-Driven Security Hardening Release for FortiOS and More
Podcast13 minSANS Internet Storm Center StormCast4d agoAppSecNetworkVulnerabilitiesCVE-2026-109618CVE-2026-109619