Executive Summary
CISA has added CVE-2026-87902, a critical WordPress Core Remote File Inclusion vulnerability, to its Known Exploited Vulnerabilities (KEV) Catalog following evidence of active exploitation in the wild. This vulnerability allows attackers to include and execute arbitrary files from remote servers, potentially leading to complete system compromise. The addition to the KEV catalog under Binding Operational Directive (BOD) 26-04 requires federal agencies to prioritize rapid remediation of this high-risk vulnerability on publicly exposed assets, as successful exploitation can grant threat actors total control of affected WordPress installations.
This incident highlights the continuing evolution of web application attack vectors and the critical importance of timely patch management in an era where WordPress powers over 40% of all websites globally, making such vulnerabilities attractive targets for cybercriminals seeking large-scale compromise opportunities.
Why This Matters Now
Remote file inclusion vulnerabilities in WordPress represent an immediate critical threat as they enable attackers to achieve complete system compromise through widely deployed web infrastructure, requiring urgent patching to prevent widespread exploitation campaigns.
Attack Path Analysis
Attackers exploited CVE-2026-87902, a remote file inclusion vulnerability in WordPress Core, to gain initial access and execute malicious code. They escalated privileges through the web application context, moved laterally to backend systems, established persistent command and control channels, exfiltrated sensitive data through unmonitored egress paths, and potentially deployed ransomware or caused service disruption.
Kill Chain Progression
This analysis maps confirmed threat intelligence to the full cloud kill chain to show where defensive gaps would emerge as an attack progresses.
Initial Compromise
Description
Exploitation of CVE-2026-87902 WordPress Core Remote File Inclusion vulnerability allows attackers to include and execute malicious files from remote locations, gaining initial foothold on the web server
Related CVEs
CVE-2026-87902
CVSS 8.1A remote file inclusion vulnerability in WordPress Core allows unauthenticated remote attackers to include arbitrary files, potentially leading to remote code execution.
Affected Products:
WordPress WordPress Core – < 6.7.2
Exploit Status:
exploited in the wild
MITRE ATT&CK® Techniques
Exploit Public-Facing Application
Ingress Tool Transfer
Web Shell
Default Accounts
File and Directory Discovery
Disable or Modify Tools
Exfiltration to Cloud Storage
Potential Compliance Exposure
Mapping incident impact across multiple compliance frameworks.
PCI DSS 4.0 – Vulnerability Management Program
Control ID: 6.2.3
NYDFS 23 NYCRR 500 – Penetration Testing and Vulnerability Assessments
Control ID: 500.05
DORA – Identification and Classification of ICT Risk
Control ID: Article 8
CISA ZTMM 2.0 – Application Security
Control ID: Applications and Workloads
NIS2 Directive – Cybersecurity Risk Management Measures
Control ID: Article 21
Sector Implications
Industry-specific impact of the vulnerabilities, including operational, regulatory, and cloud security risks.
Computer Software/Engineering
WordPress Core remote file inclusion vulnerability directly impacts software developers and web application platforms requiring immediate security updates and enhanced egress filtering.
Government Administration
CISA's BOD 26-04 mandates federal agencies prioritize rapid remediation of this KEV vulnerability on publicly exposed assets to prevent total system compromise.
Online Publishing
WordPress-based publishing platforms face critical remote file inclusion risks requiring zero trust segmentation, threat detection capabilities, and comprehensive vulnerability management protocols.
Internet
Web hosting and internet service providers must implement inline IPS, cloud firewall controls, and multicloud visibility to protect WordPress installations from exploitation.
Sources
- CISA Adds One Known Exploited Vulnerability to Cataloghttps://www.cisa.gov/news-events/alerts/2026/09/25/cisa-adds-one-known-exploited-vulnerability-catalogVerified
- WordPress Security Update 6.7.2 - Remote File Inclusion Fixhttps://wordpress.org/news/2026/09/security-update-6-7-2/Verified
- CISA Known Exploited Vulnerabilities Cataloghttps://www.cisa.gov/known-exploited-vulnerabilities-catalogVerified
Frequently Asked Questions
Cloud Native Security Fabric Mitigations and ControlsCNSF
Based on the attack progression modeled above, these are the defensive controls that would constrain each stage.
Aviatrix Zero Trust CNSF would constrain this WordPress RFI attack by limiting lateral movement between workloads and restricting unauthorized egress paths. The segmented architecture would likely reduce the blast radius from web server compromise to backend systems.
Control: Cloud Native Security Fabric (CNSF)
Mitigation: The initial compromise through WordPress RFI would likely still succeed, but CNSF visibility would enable rapid detection of anomalous file inclusion behavior and unauthorized code execution patterns on the web server workload.
Control: Zero Trust Segmentation
Mitigation: Privilege escalation attempts would likely be constrained by workload-level segmentation policies that limit the web server's access scope, reducing the attacker's ability to gain elevated permissions beyond the application context.
Control: East-West Traffic Security
Mitigation: Lateral movement from the web server to backend systems would likely be significantly constrained by east-west traffic inspection and micro-segmentation policies that restrict inter-workload communication paths.
Control: Multicloud Visibility & Control
Mitigation: Command and control communications would likely be constrained through centralized visibility across cloud environments, enabling detection of unauthorized external connections and suspicious traffic patterns from compromised workloads.
Control: Egress Security & Policy Enforcement
Mitigation: Data exfiltration attempts would likely be constrained by egress security policies that monitor and control outbound data flows, limiting unauthorized data transfer paths from compromised workloads to external destinations.
The overall impact would likely be significantly reduced in scope, with potential damage limited to the web server workload rather than spreading across backend databases and critical infrastructure systems.
Impact at a Glance
Affected Business Functions
- Web Content Management
- E-commerce Operations
- Digital Marketing Platforms
- Customer Data Processing
Estimated downtime: 3 days
Estimated loss: N/A
Potential exposure of WordPress database contents including user credentials, personal information, and website configuration data. Risk of unauthorized access to admin panels and hosted content.
Recommended Actions
Key Takeaways & Next Steps
- • Deploy Inline IPS (Suricata) with updated signatures to detect and block CVE-2026-87902 exploitation attempts and similar remote file inclusion attacks at network boundaries
- • Implement Zero Trust Segmentation with least privilege policies to contain web application compromises and prevent lateral movement to critical backend systems
- • Enable Egress Security & Policy Enforcement to monitor and control outbound traffic from web servers, blocking unauthorized data exfiltration and command & control communications
- • Deploy Multicloud Visibility & Control to detect anomalous interactions and suspicious automation patterns that may indicate ongoing exploitation or lateral movement
- • Establish Threat Detection & Anomaly Response capabilities to baseline normal web application behavior and alert on deviations that could indicate remote file inclusion attacks or post-compromise activities
