A newly surfaced dataset dubbed FortiBleed exposes what appear to be Fortinet and FortiGate VPN credentials tied to 73,932 firewall URLs at organizations around the world. Separately, researchers at SOCRadar report roughly 30,000 compromised Fortinet firewalls exposing networks to attack. Exposed VPN credentials are a direct route into corporate networks, letting attackers log in as legitimate users, bypass perimeter defenses, and stage ransomware or data theft. Fortinet gear is a perennial target, with many of these exposures stemming from past unpatched flaws and credential harvesting. Organizations cannot assume old Fortinet credentials are safe just because devices were later patched.
Threat-intelligence firm Defused reports that attackers are now exploiting three critical flaws in Fortinet's FortiSandbox, the appliance other Fortinet products rely on to judge whether files are malicious. Two (CVE-2026-39813, a JRPC API path traversal that bypasses authentication, and CVE-2026-39808, an unauthenticated command-injection that runs code as root) were patched in April; the third (CVE-2026-25089) only last week. All are unauthenticated and rated critical. Compromising a sandbox is especially dangerous because attackers can make it wave real malware through as clean. Notably, the exploit for one flaw appears to have been generated with AI and is likely faulty, yet attackers are trying it anyway.
Fortinet has patched a critical flaw in FortiSandbox, the appliance that detonates suspicious files and feeds malware verdicts to the rest of a Fortinet security deployment. The bug (CVE-2026-25089, rated 9.8) is an OS command injection in the web interface that lets a remote, unauthenticated attacker run arbitrary commands by sending crafted HTTP requests. Compromising a sandbox is especially dangerous because attackers can both pivot deeper into the network and blind the very system meant to catch malware. Fixed versions are FortiSandbox 5.0.6 and 4.4.9, with matching updates for the Cloud and PaaS editions.
Arctic Wolf has observed active exploitation of CVE-2026-35616, an authentication-bypass flaw in FortiClient Enterprise Management Server (EMS), to deliver an undocumented credential stealer called EKZ. Attackers abuse the endpoint APIs to perform administrative actions without authentication, then modify EMS configuration and VPN policies to inject malicious scripts. Seconds after endpoints establish an IPsec tunnel to a Fortinet-managed gateway, EKZ is pushed disguised as an endpoint update via VPN scripting workflows. Fortinet released emergency hotfixes for versions 7.4.5 and 7.4.6 in early April and CISA ordered federal agencies to patch the same week; Shadowserver tracked 2,000 internet-exposed EMS instances at the time.
A wave of critical patches landed across enterprise vendors. Fortinet shipped fixes for two unauthenticated code-execution flaws (CVE-2026-44277 in FortiAuthenticator, CVE-2026-26083 in FortiSandbox / FortiSandbox Cloud / FortiSandbox PaaS, both CVSS 9.1). SAP patched a 9.6-rated SQL injection in S/4HANA and a missing-auth check in SAP Commerce that allows unauthenticated code execution. Ivanti Xtraction got a fix for arbitrary file read and write. Broadcom patched a VMware Fusion macOS local-privilege-escalation (CVE-2026-41702). And the n8n automation platform shipped five CVSS 9.4 issues, including XML-driven prototype pollution that authenticated workflow editors could turn into RCE.
The Gentlemen, the second most prolific public ransomware operation of 2026 with over 320 listed victims, has had its own internal database leaked. Check Point Research and others obtained the data after a breach of the group's hosting provider 4VPS exposed their Rocket backend. The leak unmasks roughly 9 named operators centered on an administrator known as zeta88 (aka hastalamuerte), who built the RaaS panel in three days using DeepSeek and Qwen AI coding assistants, runs payouts, and joins encryption events personally. Internal chats also confirm chain-victimization: in April the group hit a UK software consultancy and then weaponized stolen client credentials to compromise one of the consultancy's customers in Turkey.
Fortinet patched two critical RCE flaws Tuesday. CVE-2026-44277 in FortiAuthenticator (Fortinet's IAM/MFA platform) lets unauthenticated attackers execute code via crafted requests. CVE-2026-26083 (CVSS 9.1) in FortiSandbox's web UI lets unauthenticated attackers run code via HTTP requests. Neither is confirmed exploited yet, but Fortinet products have a long exploitation history - CISA flagged FortiClient EMS as actively exploited in April. FortiSandbox is the threat-detection backbone for many Fortinet-centric SOCs; FortiAuthenticator gates MFA and SSO.
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.
If you patched FortiClient EMS for CVE-2026-21643 two weeks ago by upgrading to 7.4.5, you're now vulnerable to a new zero-day. CVE-2026-35616 is a CVSS 9.1 pre-authentication API access bypass affecting versions 7.4.5 and 7.4.6 - the exact versions customers upgraded to. Defused Cyber spotted exploitation in the wild starting March 31. Fortinet released an emergency weekend hotfix on Saturday, with watchTowr noting attackers deliberately timed this for the Easter holiday when security teams are at half strength.
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.
TrustStrike Labs