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Fortinet released fixes for two critical vulnerabilities that could let remote, unauthenticated attackers run unauthorized code or commands on exposed systems. The first, CVE-2026-44277, is an improper access control flaw in FortiAuthenticator with a CVSS 9.1 rating; it affects versions 8.0.0, 8.0.2, 6.6.0-6.6.8, and 6.5.0-6.5.6, and was patched in 8.0.3, 6.6.9, and 6.5.7. Fortinet said the issue stems from insufficient authorization checks on API endpoints and could allow unauthorized API access, privilege escalation, and command execution, while FortiAuthenticator Cloud is not affected.
Fortinet also disclosed CVE-2026-26083, a CVSS 9.1 missing-authorization flaw in the FortiSandbox Web UI that impacts FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS, potentially enabling arbitrary code execution across on-premises and cloud deployments. Canada’s Cyber Centre warned that the advisories span multiple Fortinet products and urged administrators to review Fortinet PSIRT notices and apply updates promptly. Public reporting said Fortinet had not observed either flaw being exploited in the wild at disclosure, but the breadth of affected security infrastructure and Fortinet’s history of high-value exploitation have increased urgency around patching exposed appliances.
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3 events from the most recent confirmed update back to the earliest known activity.
Also on 2026-05-12, the Canadian Centre for Cyber Security published advisory AV26-454 highlighting Fortinet's newly released security advisories across multiple products. It urged administrators to review the PSIRT notices and apply the necessary updates for affected on-premises and cloud products.
On 2026-05-12, Fortinet disclosed critical vulnerabilities including CVE-2026-44277 in FortiAuthenticator and CVE-2026-26083 in FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS. The company released fixed versions, including FortiAuthenticator 6.5.7, 6.6.9, and 8.0.3, and advised customers to upgrade or migrate affected deployments.
Fortinet PSIRT received CVE-2026-44277 on 2026-05-12 for an improper access control flaw in FortiAuthenticator. The vulnerability was described as network-exploitable and capable of enabling unauthorized API access, privilege escalation, and unauthorized code or command execution.
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Fortinet issued multiple 2026 security advisories covering a broad set of vulnerabilities across **FortiSandbox, FortiManager, FortiAnalyzer, FortiOS, FortiAP, FortiProxy, FortiPAM, FortiSwitchManager, FortiSwitchAXFixed,** and related cloud offerings. The most severe flaws affect **FortiSandbox**, including `CVE-2026-39808`, an unauthenticated OS command injection bug that could allow arbitrary command execution and full device compromise, `CVE-2026-39813`, a path traversal issue in the JRPC API that may enable authentication bypass and privilege escalation, and `CVE-2026-26083`, a missing authorization flaw that can expose restricted functionality and sensitive sandbox analysis data through the GUI without authentication. National cyber authorities in Canada and Belgium separately warned organizations to apply Fortinet’s fixes immediately. Fortinet also disclosed high-risk issues in management platforms, notably `CVE-2025-54820`, a stack-based buffer overflow in the **FortiManager** `fgtupdates` service that can let remote unauthenticated attackers execute unauthorized commands when the service is enabled, as well as a heap-based buffer overflow affecting **FortiAnalyzer Cloud** and **FortiManager Cloud**. Additional weaknesses across the product line include authentication and MFA bypasses, SQL injection, API denial of service, CLI command injection in FortiAP, CAPWAP daemon memory corruption in FortiOS, stored and reflected XSS, improper access control, and credential exposure. Fortinet advised customers to upgrade to fixed releases, disable exposed services such as `fgtupdates` where possible, restrict CLI, SSH, and API access, and monitor logs for anomalous authentication, privilege escalation, and endpoint activity.
Jun 29, 2026
Fortinet released multiple security advisories covering **FortiSandbox**, **FortiOS**, **FortiProxy**, **FortiPAM**, and **FortiAuthenticator**, with the most serious issue tracked as **`CVE-2026-59835`**. The high-severity FortiSandbox flaw, rated **CVSS 7.7** and classified as **`CWE-668`**, allows unauthenticated attackers to access the VNC server of malware-analysis virtual machines over the network, potentially exposing analysis sessions and interfering with sandbox operations. Fortinet said affected FortiSandbox versions are **5.0.0 through 5.0.2** and **4.4.3 through 4.4.8**, while **5.2** and **FortiSandbox PaaS** are not affected; no in-the-wild exploitation has been reported. The broader advisory set also addressed additional weaknesses including **`CVE-2026-59839`**, which could allow an authenticated CLI user to delete files from the root filesystem, along with lower-severity CRLF injection, path traversal, reflected XSS, buffer over-read, stack-based buffer overflow, and a FortiAuthenticator GUI out-of-bounds read affecting versions **6.6.0 through 6.6.2** and **6.5.0 through 6.5.7**. Canada’s Cyber Centre echoed the vendor notice and urged administrators to review the advisories and apply updates, particularly because several affected Fortinet products are commonly deployed in enterprise and internet-facing security environments.
Jul 15, 2026
Fortinet disclosed two critical vulnerabilities in **FortiSandbox** that allow remote, unauthenticated attackers to compromise exposed appliances through crafted HTTP requests. **`CVE-2026-39808`** is an OS command injection flaw in the FortiSandbox API that can lead to unauthorized command or code execution, while **`CVE-2026-39813`** is a path traversal issue in the JRPC API that can bypass authentication and enable privilege escalation. Both issues carry a **CVSS v3 score of 9.1**. The flaws affect **FortiSandbox 4.4.0 through 4.4.8**, and **`CVE-2026-39813`** also impacts **5.0.0 through 5.0.5**. Fortinet released fixes in **4.4.9** for both vulnerabilities and **5.0.6** for the JRPC issue, and said it had not observed exploitation in the wild at the time of disclosure. Organizations were urged to patch immediately, review internet-exposed deployments, and restrict API access to trusted networks until upgrades are completed.
Jun 29, 2026