Data Source: Network Packet Capture

Potential cPanel WHM CRLF Authentication Bypass (CVE-2026-41940)

Jun 8, 2026 · Domain: Network Domain: Application Domain: Web Use Case: Threat Detection Use Case: Vulnerability Tactic: Initial Access Data Source: Network Packet Capture Data Source: Network Traffic Data Source: Zeek Resources: Investigation Guide ·

Share on:

Identifies the network signature of CVE-2026-41940, a pre-auth root-level authentication bypass in cPanel and WebHost Manager (WHM) caused by a CRLF injection in the session writer. The exploit-inherent shape on the wire is a GET / request to a cPanel/WHM admin port (typically TCP/2087, 2086, 2083, 2082, 2095, 2096) carrying an Authorization: Basic header whose base64-decoded value contains CRLF-injected session fields, which causes cpsrvd to respond with a 3xx redirect whose Location header leaks a /cpsessNNNNNNNNNN token granting the attacker a privileged session. This is the network-layer equivalent of the cPanel access_log artifact identified by Unfold and watchTowr as the first bulletproof detection for this CVE: a GET / recorded with auth_method=b (HTTP Basic). Legitimate access to GET / on a WHM admin port returns 200 with the login screen and never includes HTTP Basic credentials, so this combination is not produced by normal use.

Cloud Instance Metadata Credential Path HTTP Request

May 27, 2026 · Domain: Cloud Domain: Network OS: Linux OS: Windows OS: macOS Use Case: Threat Detection Tactic: Credential Access Data Source: Network Packet Capture Resources: Investigation Guide ·

Share on:

Detects HTTP GET requests to the link-local instance metadata service (169.254.169.254) for cloud credential or token paths on AWS, GCP, or Azure. Adversaries and vulnerable workloads use scripts, shells, or application runtimes to read IAM role credentials or OAuth tokens from the metadata API. Requires the Network Packet Capture integration with HTTP decoding on ports 80 and 443 and process enrichment enabled so "process.*" fields are present.

React2Shell (CVE-2025-55182) Exploitation Attempt

Dec 5, 2025 · Domain: Network Domain: Application Domain: Web Use Case: Threat Detection Use Case: Vulnerability Tactic: Initial Access Tactic: Execution Data Source: Network Packet Capture Resources: Investigation Guide ·

Share on:

This rule detects exploitation attempts targeting CVE-2025-55182, a critical remote code execution vulnerability in React Server Components (RSC) Flight protocol. The vulnerability allows attackers to execute arbitrary code on the server by sending specially crafted deserialization payloads that exploit prototype chain traversal to access the Function constructor. This rule focuses on high-fidelity indicators of active exploitation including successful command execution responses and prototype pollution attack patterns.