Threat Intelligence - RH-ISAC Blog

Summary Threat actors are actively exploiting critical vulnerabilities in internet-exposed SolarWinds Web Help Desk (WHD) instances to achieve unauthenticated remote code execution. These intrusions follow a high-impact pattern where a single unpatched application serves as a gateway for lateral movement and full domain compromise. Once inside, attackers deploy a mix of legitimate remote monitoring tools and…

Executive Summary On 9 February 2026, Singapore authorities confirmed that the China-linked cyber espionage group UNC3886 conducted a deliberate, targeted, and well-planned operation against all four of the country’s major telecommunications operators: M1, SIMBA Telecom, Singtel, and StarHub. Threat Actor Profile UNC3886 is reported as a highly disciplined and stealthy state-linked threat actor. The group targets strategic organizations…

Summary A newly identified cluster of automated malicious activity is targeting Fortinet FortiGate appliances by exploiting an unauthenticated Single Sign-On (SSO) bypass, according to new intelligence from Arctic Wolf. Commencing in January 2026, threat actors have successfully compromised devices even after the application of patches for CVE-2025-59718 and CVE-2025-59719, indicating a new attack path or incomplete remediation. The automated…

Executive Summary Okta has issued a warning about sophisticated vishing (voice-based social engineering) attacks targeting single sign-on (SSO) credentials. Threat actors are using custom phishing kits designed specifically for real-time voice call interactions to steal Okta SSO credentials and conduct data theft operations. These attacks are currently active and targeting companies in the Fintech, financial, and…

Summary Securonix researchers have identified a new malware campaign, dubbed PHALT#BLYX, actively targeting the hospitality sector with a multi-stage infection chain. Threat actors leverage a “ClickFix” social engineering tactic, using fake reservation emails and deceptive “Blue Screen of Death” (BSOD) pages to deceive victims into executing malicious PowerShell commands. This campaign notably bypasses defenses by…

Summary A critical unauthenticated vulnerability dubbed MongoBleed (CVE-2025-14847) has been disclosed in MongoDB’s zlib message compression, allowing remote attackers to extract sensitive data from uninitialized memory. This flaw affects nearly all versions released since 2017, enabling the exfiltration of credentials, PII, and session tokens without requiring authentication. While MongoDB released patches for supported versions in late December…

Summary A  vulnerability with a CVSS score of 10.0, tracked as CVE-2025-55182 in React and CVE-2025-66478 in Next.js, has been publicly disclosed, enabling unauthenticated remote code execution (RCE). The flaw resides in how React Server Components (RSC) decode payloads sent to Server Function endpoints, allowing attackers to execute arbitrary JavaScript on the server via specially crafted HTTP requests. Sector Impact…

Summary A financially motivated threat cluster has been actively targeting the freight and logistics industry since at least June 2025 in a cyber-enabled cargo theft campaign, according to a new report from Proofpoint. The primary goal of the campaign is to gain remote access to logistics networks to steal high-value physical goods, mainly food and beverage…

Summary The China-nexus threat cluster known as UNC5221 is actively exploiting F5 BIG-IP appliances following a confirmed breach of F5’s internal network that resulted in the theft of BIG-IP source code and vulnerability data, according to a new report from Resecurity. UNC5221 utilizes a custom-built, highly sophisticated toolkit centered on the BRICKSTORM backdoor to exploit F5 BIG-IP devices….

Summary Cybersecurity firm F5 publicly disclosed a breach by an unnamed nation-state actor who gained long-term access to the company’s product development environment, including the engineering platforms for its flagship BIG-IP product. The attackers exfiltrated a portion of the BIG-IP source code, information about undisclosed security vulnerabilities, and configuration/implementation details for a limited number of customers….