Forescout Vedere Labs disclosed BRIDGE:BREAK, a set of 22 new vulnerabilities in serial-to-IP converters from Lantronix and Silex that together expose roughly 20,000 devices visible on the open internet. Serial-to-IP converters bridge legacy serial-port equipment (older industrial PLCs, building-automation controllers, medical devices, laboratory instruments) to modern TCP/IP networks, so attackers compromising them can read and tamper with the raw serial traffic flowing to field equipment. Eight flaws affect Lantronix EDS3000PS and EDS5000 series; fourteen affect Silex SD330-AC. The categories span unauthenticated remote code execution (CVE-2026-32955, CVE-2026-32956, CVE-2026-32961, CVE-2025-67034 through 67038, CVE-2025-67041), authentication bypass (CVE-2026-32960, CVE-2025-67039), full device takeover (CVE-2026-32965, CVE-2025-70082, plus FSCT-2025-0021 with no CVE assigned), firmware tampering (CVE-2026-32958), arbitrary file upload (CVE-2026-32957), and information disclosure (CVE-2026-32959). The researchers describe a realistic kill chain where an attacker first pops an internet-facing edge device like an industrial router, then pivots through a compromised serial-to-IP converter to silently alter sensor readings or actuator commands flowing to field assets - data-integrity attacks that are invisible to most OT monitoring. Both vendors have released firmware updates.
Security firm Endor Labs disclosed a critical remote code execution flaw in protobuf.js, a widely used JavaScript implementation of Google's Protocol Buffers with nearly 50 million weekly downloads on npm. The bug lets attackers achieve RCE when an application loads a malicious protobuf schema. Root cause: protobuf.js builds JavaScript functions from protobuf schemas by concatenating strings and executing them via the Function() constructor, but doesn't validate schema-derived identifiers like message names. An attacker can supply a crafted schema that injects arbitrary JavaScript into the generated function, which then runs when the app processes any message using that schema. This opens access to environment variables, credentials, databases, and internal systems - plus lateral movement within infrastructure. Developer machines are also at risk if they load and decode untrusted schemas locally. The flaw has a proof-of-concept exploit in Endor Labs' advisory and 'exploitation is straightforward' per the researchers, but no in-the-wild exploitation has been observed yet. No official CVE assigned - tracked as GHSA-xq3m-2v4x-88gg. Reported March 2 by Cristian Staicu, patched on GitHub March 11, npm patches released April 4 (8.x branch) and April 15 (7.x branch).
Day-after recovery: a PoC exploit for a critical vulnerability in Fortinet's FortiSandbox product has been publicly available since April 17. CVE-2026-39808 allows an unauthenticated attacker to execute arbitrary code on affected appliances via the web management interface. FortiSandbox is Fortinet's network-based malware analysis product used to inspect suspicious files before they reach endpoints. Because it sits in the malware analysis path, a compromised FortiSandbox gives attackers visibility into every suspicious file your environment has flagged, including real phishing attempts and incident samples. The PoC release doesn't indicate confirmed in-the-wild exploitation yet, but based on recent patterns the window between public PoC and mass scanning is typically measured in hours. CISA has not yet added this to KEV.
Cisco has patched four critical vulnerabilities this week across Webex and Identity Services Engine (ISE). The standout flaw is CVE-2026-20184 in Cisco Webex Services with SSO integration via Control Hub - it allows an unauthenticated remote attacker to impersonate any user in the service due to incorrect certificate validation in the SSO flow. This is particularly dangerous for organizations using Webex with SAML and centralized identity management. Alongside it: CVE-2026-20180 and CVE-2026-20186 (both CVSS 9.9) affect Cisco ISE and ISE Passive Identity Connector, allowing authenticated attackers with even read-only admin credentials to execute arbitrary commands on the underlying OS and escalate to root. CVE-2026-20147 is a path traversal flaw in the same products. ISE versions before 3.2, plus 3.2, 3.3, 3.4, and 3.5 branches are all affected. No workarounds - only software updates fix these. In single-node ISE deployments, exploitation can also knock the node offline, blocking network access for unauthenticated endpoints.
Adobe has released an emergency security update (APSB26-43, priority-1) to patch CVE-2026-34621, the Adobe Reader zero-day we reported on April 10 that had been exploited since December 2025 via malicious PDF documents. The flaw has now been classified as a prototype pollution vulnerability leading to arbitrary code execution - more severe than the initial fingerprinting and data theft we described. Adobe confirmed it's worse than just information leakage: the underlying bug can achieve full RCE, not just the reconnaissance stage observed in early exploitation. CVSS was initially scored 9.6 but Adobe revised it down to 8.6 after changing the attack vector from Network to Local. EXPMON researcher Haifei Li, who first disclosed the flaw, was credited by Adobe. All users on Windows and macOS should update immediately - Adobe assigned this patch its highest priority rating.
A critical vulnerability in the Ninja Forms File Uploads premium add-on for WordPress allows attackers to upload arbitrary files - including PHP web shells - without any authentication. Over 800,000 WordPress sites use Ninja Forms, and the File Uploads extension is one of its most popular premium add-ons. Successful exploitation gives an attacker full code execution on the web server. No user interaction required - just a crafted request to the file upload endpoint.
Cisco Talos uncovered a large-scale automated campaign by threat cluster UAT-10608 that exploits React2Shell - a CVSS 10.0 pre-auth RCE flaw in React Server Components used by Next.js. One crafted HTTP request is all it takes to get code execution, no credentials needed. The attackers scan with Shodan and Censys, breach Next.js apps, then deploy the NEXUS Listener framework to harvest database credentials, SSH keys, AWS tokens, Stripe API keys, Kubernetes secrets, and GitHub tokens at scale. At least 766 hosts across multiple cloud providers were compromised within 24 hours.
Two flaws in Progress ShareFile's Storage Zones Controller can be chained for unauthenticated remote code execution - no credentials needed. An attacker first bypasses authentication via improper HTTP redirect handling, then uploads a malicious webshell through the file upload function. watchTowr published full technical details and a proof-of-concept. Around 30,000 instances are exposed online. File transfer solutions are a favorite ransomware target - Clop hit Accellion, GoAnywhere, MOVEit, and Cleo the same way.
A CVSS 9.1 SQL injection flaw in Fortinet's FortiClient Endpoint Management Server is now being exploited in the wild - four days before anyone flagged it publicly. An attacker only needs one crafted HTTP request with a malicious Site header to execute arbitrary SQL against the backing PostgreSQL database, no credentials required. Roughly 1,000 to 2,400 FortiClient EMS instances are exposed to the internet, mostly in the US and Europe.
Remember that F5 BIG-IP APM bug from last year everyone treated as a denial-of-service issue? Turns out it's pre-auth remote code execution - CVSS 9.3. F5 quietly reclassified it after new findings in March 2026 and confirmed exploitation in the wild. CISA added it to the KEV catalog with a March 30 patch deadline. That's tomorrow.
TrustStrike Labs