Threat briefs

Adversaries modify the dynamic linker preload shared object (`/etc/ld.so.preload`) or configuration files (`/etc/ld.so.conf.d/*`, `/etc/ld.so.conf`) inside Linux containers to hijack the dynamic linker, forcing the system to load malicious libraries at runtime, thereby gaining unauthorized access, maintaining persistence, escalating privileges, and evading detection of malicious processes.

Adversaries exploit containerized environments by executing malicious code or interactive shells from transient, low-trust directories like /tmp or /dev/shm, or using executables with hidden names, to evade detection, establish persistence, and facilitate data exfiltration.

A detection rule from Elastic identifies adversaries reading Kubernetes service account tokens or CA certificates within containers, typically using utilities like `cat` on `/var/run/secrets/kubernetes.io/serviceaccount/token` and `ca.crt` to authenticate to the Kubernetes API server and escalate privileges or expand access within the cluster.

Adversaries may search for sensitive credentials, such as SSH keys and passwords, within Linux containers using utilities like grep and find, potentially leading to unauthorized access or container escape.

An attacker using system search utilities like `grep` or `find` within a containerized environment to locate cloud credentials (AWS, Azure, GCP) indicates an attempt to gain unauthorized access to sensitive cloud resources or perform a container breakout to compromise the underlying cloud infrastructure.

This threat brief details how adversaries download files from the internet into Linux containers using `curl` or `wget` to stage tools, payloads, or establish application-layer command and control (C2), which detection engineers can identify by monitoring process execution within containers and correlating with audit logs.

Attackers utilize the `curl` command-line tool with SOCKS proxy options inside Linux containers to bypass network restrictions, enabling command and control communications or data exfiltration, which defenders can detect by monitoring process execution within container environments for suspicious `curl` arguments and network tunneling activity.

A critical arbitrary file upload vulnerability (CVE-2026-14270) in the Extra Checkout Options plugin for WordPress, affecting versions up to and including 2.3.2, allows low-privileged authenticated users to modify upload allowlists and upload malicious PHP files via an AJAX action, ultimately achieving remote code execution on the server.

A vulnerability in Apache Tomcat allows a remote, anonymous attacker to perform a Denial of Service attack, potentially disrupting service availability for applications hosted on the affected server.

An attacker can exploit multiple vulnerabilities in BlackBerry UEM Management Console to perform cross-site scripting attacks, cause a denial of service, and disclose information.

Multiple unspecified vulnerabilities in the Xen hypervisor allow an attacker to escalate privileges, disclose confidential information, or cause a denial-of-service condition affecting virtualized environments.

Multiple vulnerabilities exist in IBM WebSphere Application Server and IBM WebSphere Application Server Liberty that an attacker can exploit to execute arbitrary code, escalate privileges, perform denial of service attacks, disclose sensitive information, manipulate files, conduct cross-site scripting attacks, and bypass security measures.

Multiple vulnerabilities in Apache Traffic Server can be exploited by a remote, anonymous attacker to bypass security measures, disclose or manipulate data, trigger a denial-of-service, and potentially achieve code execution.

Multiple vulnerabilities in Broadcom Brocade SANnav can be exploited by an attacker from an adjacent network to achieve information disclosure, execute SQL injection attacks, and manipulate data within the system.

An out-of-bounds write vulnerability, CVE-2026-18220, exists in the BFD library's DLX ELF backend (bfd/elf32-dlx.c) in GNU binutils, allowing attackers to achieve arbitrary code execution via a specially crafted ELF/DLX object file processed by BFD-consuming tools.

An unauthenticated attacker can exploit a Stored Cross-Site Scripting vulnerability (CVE-2026-16655) in the Fluent Forms WordPress plugin, versions up to and including 6.2.7, via insufficient input sanitization of the Name Field Nested `password` Member, allowing injection of arbitrary web scripts that execute in a user's browser upon page access.

The GTM4WP (Google Tag Manager) plugin for WordPress, in versions up to and including 1.22.3, is vulnerable to stored cross-site scripting (XSS) via CVE-2026-16597, allowing unauthenticated attackers to inject arbitrary web scripts through WooCommerce billing fields during a guest checkout, which execute when a user accesses the compromised page.

Unauthenticated attackers can exploit a Missing Authorization vulnerability (CVE-2026-14488) in the MB Frontend Submission extension of the Meta Box AIO plugin for WordPress, affecting versions up to 3.8.0, to delete arbitrary posts and pages by injecting a crafted post ID via a GET parameter.

CVE-2025-10656 describes a Missing Authorization vulnerability in the Spreadsheet Price Changer for WooCommerce and WP E-commerce - Light plugin for WordPress, affecting all versions up to and including 2.4.37, which allows unauthenticated attackers to create new administrator accounts, leading to privilege escalation and potential full control over affected WordPress sites.

An attacker can exploit multiple vulnerabilities found in Red Hat Enterprise Linux, specifically within the librest and pipewire components, to bypass security measures and achieve arbitrary code execution on affected systems, posing a significant risk to the integrity and confidentiality of the system.

A remote, authenticated attacker can exploit a vulnerability in PackageKit to bypass security mechanisms.

A vulnerability in Gitea allows a remote, unauthenticated attacker to execute arbitrary code, which could lead to full compromise of the affected Gitea instance and potentially the underlying server.

A remote, authenticated attacker can exploit a SQL injection vulnerability in Tanium Endpoint Management, enabling the execution of arbitrary SQL commands and potentially leading to data manipulation or unauthorized access.

Multiple vulnerabilities exist in IBM WebSphere Application Server Liberty that an attacker can exploit to perform a Denial of Service attack.

The Database for CF7 plugin for WordPress is vulnerable to stored Cross-Site Scripting (XSS) via Array Form Field Values, allowing unauthenticated attackers to inject arbitrary web scripts by sending specially crafted array-structured input to the Contact Form 7 REST API endpoint /wp-json/contact-form-7/v1/contact-forms/{id}/feedback, which are insufficiently sanitized and executed when a user accesses an affected page.

An anonymous, remote attacker can exploit a vulnerability in Apache Axis2 to execute arbitrary program code. This flaw allows for critical remote code execution without authentication, posing a significant risk to systems running the affected software.

CVE-2026-18191 describes a critical Hidden Functionality vulnerability in Vacron VIN-DS783E-E6 devices that allows unauthenticated remote attackers to exploit a specific hidden function to obtain administrator credentials, leading to full device compromise.

CrowdStrike's AI security research team has identified 18 new prompt injection techniques, expanding its taxonomy to over 200 methods, which enable adversaries to manipulate AI systems and agents through indirect means like hidden context, delayed triggers, and special token injection, leading to unauthorized actions such as data exfiltration or arbitrary command execution.

The Easy Digital Downloads plugin for WordPress versions up to and including 3.6.9 is vulnerable to Arbitrary File Upload (CVE-2026-12476) due to insufficient file type validation, allowing authenticated attackers with Shop Manager-level access or higher to upload arbitrary files which can lead to remote code execution.

The Wholesale for WooCommerce plugin for WordPress is vulnerable to privilege escalation due to insufficient validation and capability checks in `save_requests_meta()` function, allowing authenticated attackers with author-level access or higher to escalate their privileges to administrator by supplying 'administrator' as the `user_role_set` value in a crafted request.