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Internet Threat Reports
cPanel CVE-2026-41940 Exploited to Deploy Filemanager Backdoor
In May 2026, a critical authentication bypass vulnerability, CVE-2026-41940, was discovered in cPanel and WebHost Manager (WHM) software, allowing unauthenticated remote attackers to gain administrative access to affected systems. Exploiting this flaw, a threat actor known as Mr_Rot13 deployed a backdoor named Filemanager, enabling unauthorized control over compromised environments. The attack involved injecting malicious code to create unauthorized sessions, leading to potential data theft, malware deployment, and system compromise. ([support.cpanel.net](https://support.cpanel.net/hc/en-us/articles/40073787579671-Security-CVE-2026-41940-cPanel-WHM-WP2-Security-Update-04-28-2026?utm_source=openai)) This incident underscores the escalating threat posed by sophisticated cyber actors targeting widely used web hosting platforms. The rapid exploitation of CVE-2026-41940 highlights the critical need for organizations to promptly apply security patches and implement robust monitoring to detect and mitigate unauthorized access attempts.
4 months ago
Kill Chain
Critical cPanel and WHM Vulnerabilities Require Immediate Attention
In May 2026, cPanel and Web Host Manager (WHM) disclosed three critical vulnerabilities: CVE-2026-29201, CVE-2026-29202, and CVE-2026-29203. These flaws allowed for arbitrary file read, code execution, and potential privilege escalation. Exploiting these vulnerabilities, attackers could gain unauthorized access to servers, compromising the security of hosted websites and data. cPanel promptly released patches to address these issues, urging users to update to the latest versions to mitigate risks. This incident underscores the persistent threat posed by software vulnerabilities in widely used web hosting platforms. The rapid exploitation of such flaws highlights the importance of timely patch management and proactive security measures to protect against unauthorized access and potential data breaches.
4 months ago
Kill Chain
PCPJack Malware: A New Threat to Cloud Security
In May 2026, cybersecurity researchers identified a sophisticated malware named PCPJack, designed to infiltrate cloud environments by exploiting exposed services and harvesting sensitive credentials. The malware initiates its attack through a 'bootstrap' module that establishes persistence and downloads additional components. It then employs a 'monitor' script to collect system metrics and exfiltrate configuration files, cloud service credentials, and cryptocurrency wallets. Notably, PCPJack targets services such as AWS, GitHub, Slack, and popular email platforms, posing significant risks to organizations' cloud infrastructures. PCPJack's unique approach includes utilizing parquet files from Common Crawl for stealthy, pre-validated target discovery, allowing it to efficiently identify and exploit vulnerable cloud services. This method underscores the evolving tactics of threat actors in leveraging open-source data for malicious purposes. The incident highlights the critical need for organizations to implement robust cloud security measures, including the use of credential vaults and multifactor authentication, to safeguard against such advanced threats.
4 months ago
Kill Chain
ACSC Alerts on ClickFix Attacks Distributing Vidar Stealer via Compromised WordPress Sites
In May 2026, the Australian Cyber Security Centre (ACSC) identified a malware campaign targeting Australian organizations through compromised WordPress websites. Attackers employed the 'ClickFix' social engineering technique, presenting users with fake Cloudflare verification prompts that instructed them to execute malicious PowerShell commands. This led to the installation of Vidar Stealer, an information-stealing malware capable of exfiltrating credentials, browser data, cryptocurrency wallets, and system information. The campaign exploited user trust in legitimate websites to facilitate malware distribution. This incident underscores the evolving sophistication of social engineering attacks and the persistent threat posed by infostealer malware. Organizations must remain vigilant, as such techniques can bypass traditional security measures by manipulating user behavior. The ACSC's advisory highlights the need for enhanced security awareness and technical controls to mitigate these risks.
4 months ago
Kill Chain
Critical vm2 Sandbox Vulnerability (CVE-2026-26956) Allows Host Code Execution
In May 2026, a critical vulnerability identified as CVE-2026-26956 was discovered in vm2, a widely-used Node.js sandboxing library. This flaw allows attackers to escape the sandbox environment and execute arbitrary code on the host system. The issue affects vm2 version 3.10.4 and earlier, particularly in environments running Node.js 25 with WebAssembly exception handling and JSTag support enabled. Exploitation involves triggering a specially crafted TypeError, leading to the leakage of host-side error objects into the sandbox, which attackers can manipulate to gain access to Node.js internals and execute commands on the host. The discovery of this vulnerability underscores the challenges in securely isolating untrusted code within JavaScript sandbox environments. Given vm2's extensive use in online coding platforms, automation tools, and SaaS applications, the potential impact is significant. Users are strongly advised to upgrade to vm2 version 3.10.5 or later to mitigate the risk associated with this vulnerability.
4 months ago
Kill Chain
xlabs_v1 Botnet: A New Threat Exploiting ADB-Exposed IoT Devices
In May 2026, cybersecurity researchers uncovered a new botnet named xlabs_v1, derived from the Mirai malware, which exploits internet-exposed devices running Android Debug Bridge (ADB) on TCP port 5555. This botnet targets devices such as Android TV boxes, set-top boxes, and smart TVs, enlisting them to perform distributed denial-of-service (DDoS) attacks, particularly against game servers and Minecraft hosts. The malware supports 21 flood variants across TCP, UDP, and raw protocols, including RakNet and OpenVPN-shaped UDP, capable of bypassing consumer-grade DDoS protection. Notably, xlabs_v1 lacks a persistence mechanism, requiring re-infection for each attack, and includes a 'killer' subsystem to eliminate competing malware, ensuring full control over the compromised device's bandwidth. ([thehackernews.com](https://thehackernews.com/2026/05/mirai-based-xlabsv1-botnet-exploits-adb.html?utm_source=openai)) The emergence of xlabs_v1 highlights the ongoing evolution of IoT-targeted malware and the increasing sophistication of DDoS-for-hire services. This incident underscores the critical need for securing IoT devices, particularly those with default-enabled services like ADB, to prevent their exploitation in large-scale cyber attacks.
4 months ago
Kill Chain
Urgent: cPanel Vulnerability CVE-2026-41940 Under Active Exploitation
In late April 2026, a critical authentication bypass vulnerability, CVE-2026-41940, was disclosed in cPanel and WHM software, affecting versions after 11.40. This flaw allows unauthenticated remote attackers to gain administrative access to servers, posing a significant risk to millions of websites. Within 24 hours of disclosure, multiple threat actors began exploiting the vulnerability, leading to server compromises, website defacements, and ransomware deployments. Notably, the "sorry" ransomware encrypts files and appends a ".sorry" extension, with over 7,000 cPanel instances identified as compromised. ([helpnetsecurity.com](https://www.helpnetsecurity.com/2026/05/04/multiple-threat-actors-actively-exploit-cpanel-vulnerability-cve-2026-41940/?utm_source=openai)) The rapid exploitation of CVE-2026-41940 underscores the critical need for organizations to promptly apply security patches and implement robust monitoring systems. The incident highlights the increasing speed at which threat actors exploit newly disclosed vulnerabilities, emphasizing the importance of proactive cybersecurity measures.
4 months ago
Kill Chain
Critical cPanel Vulnerability CVE-2026-41940 Exploited by 'Sorry' Ransomware
In late April 2026, a critical authentication bypass vulnerability, CVE-2026-41940, was discovered in cPanel and WHM software, affecting versions released after 11.40. This flaw allows unauthenticated attackers to gain root-level access to servers, leading to potential data theft, malware deployment, or complete server compromise. Exploitation of this vulnerability has been observed in the wild, with attackers deploying the 'Sorry' ransomware to encrypt data on compromised servers. The ransomware appends the '.sorry' extension to encrypted files and demands ransom payments via Tox messaging platform. Given the widespread use of cPanel and WHM across millions of websites, the impact is substantial, with thousands of servers reportedly compromised. Administrators are urged to apply the latest security patches immediately to mitigate this threat. ([support.cpanel.net](https://support.cpanel.net/hc/en-us/articles/40073787579671-Security-CVE-2026-41940-cPanel-WHM-WP2-Security-Update-04-28-2026?utm_source=openai)) This incident underscores the critical importance of timely patch management and robust security practices in web hosting environments. The rapid exploitation of CVE-2026-41940 highlights the evolving tactics of threat actors targeting widely used infrastructure components, emphasizing the need for continuous vigilance and proactive defense measures.
4 months ago
Kill Chain
Critical cPanel & WHM Authentication Bypass Vulnerability (CVE-2026-41940) Discovered
In April 2026, a critical authentication bypass vulnerability, CVE-2026-41940, was discovered in cPanel & WHM, affecting versions prior to 11.110.0.97, 11.118.0.63, 11.126.0.54, 11.132.0.29, 11.134.0.20, and 11.136.0.5. This flaw allows remote, unauthenticated attackers to gain root-level administrative access by injecting arbitrary values into server-side session files, effectively bypassing all credential checks. Exploitation in the wild has been confirmed, with attackers leveraging this vulnerability to compromise entire systems, leading to data theft, malware deployment, or complete server erasure. cPanel has released patches to address this issue, and administrators are urged to update immediately to secure their systems. ([support.cpanel.net](https://support.cpanel.net/hc/en-us/articles/40073787579671-Security-CVE-2026-41940-cPanel-WHM-WP2-Security-Update-04-28-2026?utm_source=openai)) The emergence of this vulnerability underscores the critical importance of timely software updates and robust security practices. With the availability of public proof-of-concept exploits and active exploitation observed, organizations must prioritize patching and monitoring to mitigate the risk of unauthorized access and potential system compromise.
4 months ago
Kill Chain
Urgent Security Update: cPanel & WHM Vulnerability CVE-2026-41940
In April 2026, a critical authentication bypass vulnerability, CVE-2026-41940, was discovered in cPanel and WebHost Manager (WHM) software versions prior to 11.110.0.97, 11.118.0.63, 11.126.0.54, 11.132.0.29, 11.134.0.20, and 11.136.0.5. This flaw allows unauthenticated remote attackers to gain unauthorized access to the control panel, potentially leading to data breaches, malware installation, or complete server compromise. The vulnerability has been actively exploited in the wild, prompting immediate action from hosting providers and website administrators. ([support.cpanel.net](https://support.cpanel.net/hc/en-us/articles/40073787579671-Security-CVE-2026-41940-cPanel-WHM-WP2-Security-Update-04-28-2026?utm_source=openai)) The inclusion of CVE-2026-41940 in CISA's Known Exploited Vulnerabilities Catalog underscores the ongoing threat posed by unpatched software vulnerabilities. This incident highlights the critical importance of timely software updates and robust security practices to mitigate risks associated with authentication bypass flaws. ([nvd.nist.gov](https://nvd.nist.gov/vuln/detail/CVE-2026-41940?utm_source=openai))
4 months ago
Kill Chain
Critical cPanel Authentication Bypass Vulnerability CVE-2026-41940
In April 2026, a critical authentication bypass vulnerability, CVE-2026-41940, was discovered in cPanel and WebHost Manager (WHM) versions released after 11.40. This flaw allowed unauthenticated remote attackers to gain unauthorized administrative access to affected systems. The vulnerability stemmed from improper handling of user input during the login process, enabling attackers to inject arbitrary data into server-side session files and bypass password verification entirely. cPanel released patches on April 28, 2026, addressing the issue across multiple version branches. However, exploitation had already been observed in the wild prior to the release of these fixes. The Cybersecurity and Infrastructure Security Agency (CISA) added the CVE to its Known Exploited Vulnerabilities list on April 30, 2026, underscoring the severity and active exploitation of this vulnerability. Given the widespread use of cPanel and WHM, with approximately 1.5 million instances exposed online, the potential impact of this vulnerability is significant. Organizations utilizing these platforms should prioritize applying the available patches and reviewing their systems for indicators of compromise to mitigate the risk of unauthorized access and potential data breaches.
4 months ago
Kill Chain
Critical cPanel & WHM Authentication Bypass Vulnerability (CVE-2026-41940) Exploited in the Wild
In late April 2026, a critical authentication bypass vulnerability, CVE-2026-41940, was discovered in cPanel & WHM, affecting versions released after 11.40. This flaw allows unauthenticated remote attackers to gain administrative access to affected systems by exploiting improper session handling during the login process. The vulnerability has been actively exploited in the wild since at least late February 2026, with approximately 1.5 million cPanel instances exposed online. Successful exploitation grants attackers control over the cPanel host system, its configurations, databases, and managed websites. The rapid exploitation of CVE-2026-41940 underscores the increasing sophistication and speed of threat actors in leveraging zero-day vulnerabilities. Organizations must prioritize timely patching and robust security measures to mitigate such risks. This incident highlights the critical importance of proactive vulnerability management and the need for continuous monitoring to detect and respond to emerging threats promptly.
4 months ago
Kill Chain
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