CVE-2025-59718

rative interfaces and SSL-VPN gateways; this post maps eight Fortinet CVEs with associated Qualys detections, including CVE-2026-24858, CVE-2025-59718, and CVE-2025-59719. Large-scale credential-abuse activity has been publicly reported, and Fortinet confirmed credential reuse , brute-force activity, and prior exploitation of earlier FortiCloud SSO iss

A database of over 86,000 confirmed working credentials was created during the credential-harvesting campaign.

Attackers are exploiting FortiGate devices to breach networks and steal configuration data containing service account credentials and network details. SentinelOne researchers warn that attackers are exploiting vulnerabilities or weak credentials in FortiGate devices to gain initial access to corporate networks. Once inside, they extract configuration files that may contain service account credentials and information about […]

Fortinet released fixes for a critical FortiOS SSO auth bypass (CVE-2026-24858) actively exploited, impacting FortiOS, FortiManager, and FortiAnalyzer. Fortinet started rolling out patches for a critical FortiOS flaw under active attack. The bug, CVE-2026-24858 (CVSS score of 9.4), lets attackers bypass authentication via SSO. It affects FortiOS, FortiManager, and FortiAnalyzer, while Fortinet checks if other […]

Fortinet has disclosed a critical authentication bypass zero-day vulnerability affecting its FortiCloud single sign-on feature after the company took the emergency step of temporarily disabling the cloud authentication service globally to stop active exploitation. The US Cybersecurity and Infrastructure Security Agency added the vulnerability to its Known Exploited Vulnerabilities catalog the same day. The vulnerability, […]

Tracked as CVE-2026-24858, the bug allows attackers to log into devices registered to other FortiCloud accounts.

Fortinet has begun releasing FortiOS versions that fix CVE-2026-24858, a critical zero-day vulnerability that allowed attackers to log into targeted organizations’ FortiGate firewalls. “This vulnerability was found being exploited in the wild by two malicious FortiCloud accounts, which were locked out on [January 22, 2026],” the company shared. About CVE-2026-24858 On January 20, several Fortinet customers revealed that attackers gained access to their FortiGate firewalls and created new local admin accounts despite the devices running … More →

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Fortinet has confirmed that a new attack campaign observed recently against customer devices is exploiting an unpatched issue to bypass authentication. The new attacks are different from a previous campaign seen in December that targeted two vulnerabilities related to FortiCloud single sign-on (SSO) authentication. “Recently, a small number of customers reported unexpected login activity occurring […]

Fortinet confirmed attacks are bypassing FortiCloud SSO authentication, affecting even fully patched devices, similar to recent SSO flaws. Fortinet confirmed attacks bypass FortiCloud SSO on fully patched devices. Threat actors automate firewall changes, add users, enable VPNs, and steal configs, in campaigns resembling December 2025 exploits of critical FortiCloud SSO flaws. Arctic Wolf researchers reported […]

Similar to recent FortiCloud single sign-on (SSO) login vulnerabilities, the attacks bypass authentication.

Hackers bypass the FortiCloud SSO login authentication to create new accounts and change device configurations.

Arctic Wolf warned of a new wave of automated attacks making unauthorized firewall configuration changes on Fortinet FortiGate devices. Arctic Wolf researchers reported a new automated attack cluster observed since January 15, 2026, targeting FortiGate devices. Attackers created generic accounts for persistence, enabled VPN access, and exfiltrated firewall configurations. The activity resembles a December 2025 […]

CVE-2025-59718, a critical authentication bypass flaw that attackers exploited in December 2025 to compromise FortiGate appliances, appears to persist in newer, purportedly fixed releases of the underlying FortiOS. According to Fortinet, CVE-2025-59718 had been fixed in FortiOS versions 7.6.4 or above, 7.4.9 or above, 7.2.12 or above, and 7.0.18 or above. But on Tuesday, a Fortinet administrator posted on Reddit asking whether other enterprise admins had observed attackers logging in and creating new accounts on … More →

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A new round of the weekly Security Affairs newsletter has arrived! Every week, the best security articles from Security Affairs are free in your email box. Enjoy a new round of the weekly SecurityAffairs newsletter, including the international press. ATM Jackpotting ring busted: 54 indicted by DoJ U.S. CISA adds a flaw in WatchGuard Fireware […]

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U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds a WatchGuard Fireware OS flaw to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added a WatchGuard Firebox OS vulnerability, tracked as CVE-2025-14733 (CVSS Score of 9.3), to its Known Exploited Vulnerabilities (KEV) catalog. This flaw is a critical out-of-bounds write vulnerability in WatchGuard Fireware […]

Attackers are exploiting a recently revealed vulnerability (CVE-2025-59718) to bypass authentication on Fortinet’s FortiGate firewalls, and are leveraging the achieved access to export their system configuration files, Arctic Wolf researchers warned on Tuesday. Configuration files can expose information about the underlying network and infrastructure, firewall and security policies, encrypted/hashed passwords, and more. Some of this data can come in handy for executing successfuly attacks at a later date. CVE-2025-59718 and CVE-2025-59719 Fortinet discovered CVE-2025-59718 and … More →

U.S. CISA adds a vulnerability impacting multiple products to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability, tracked as CVE-2025-59718 (CVSS Score of 9.1), to its Known Exploited Vulnerabilities (KEV) catalog. Threat actors started exploiting two critical flaws, tracked as CVE-2025-59718 and CVE-2025-59719 (CVSS score of 9.1), […]

Threat actors aren’t wasting time taking advantage of newly-revealed vulnerabilities in Fortinet device authentication. Researchers at Arctic Wolf said they are seeing malicious single sign on (SSO) attempts trying to leverage the holes in FortiGate next generation firewalls since Fortinet alerted admins about the vulnerabilities on December 9. “We have seen tens of intrusions since […]

Threat actors are exploiting two critical Fortinet flaws, tracked as CVE-2025-59718 and CVE-2025-59719, days after patch release, impacting multiple Fortinet products. Threat actors started exploiting two critical flaws, tracked as CVE-2025-59718 and CVE-2025-59719 (CVSS score of 9.1), in Fortinet products days after patch release, Arctic Wolf warns. Last week, Fortinet addressed 18 vulnerabilities, including the two flaws […]

Threat actors are exploiting the two critical authentication bypass vulnerabilities against FortiGate appliances.

Admins using FortiCloud SSO (single sign on) to authenticate access to Fortinet products are urged to upgrade the software running some of the company’s gateway products as soon as possible, or risk their networks being compromised. “Users of Fortinet appliances should, for now, disable SSO until they are able to patch the devices,” advised Johannes […]

Fortinet patched 18 flaws, including two authentication-bypass bugs affecting FortiOS, FortiWeb, FortiProxy, and FortiSwitchManager with FortiCloud SSO enabled. Fortinet addressed 18 vulnerabilities, including two authentication-bypass flaws, tracked as CVE-2025-59718 and CVE-2025-59719 (CVSS score of 9.1), affecting FortiOS, FortiWeb, FortiProxy, and FortiSwitchManager when FortiCloud SSO is enabled. Both vulnerabilities are improper verification of cryptographic signature issues. […]

The two security defects impact FortiOS, FortiWeb, FortiProxy, and FortiSwitchManager with FortiCloud SSO login authentication enabled.