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FortiPAM

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Fortinet Patches Critical Vulnerabilities in FortiMonitorOnSight, Chrome Extension

Fortinet patched 10 vulnerabilities including two critical authentication flaws, CVE-2026-84390 (CVSS 9.6) and CVE-2026-84388 (CVSS 9.1), in FortiMonitorOnSight and the FortiPAM Chrome extension.

Fortinet's September patch release fixes CVE-2026-84390, a sensitive-information issue in the FortiMonitorOnSight web portal that lets unauthenticated attackers bypass authentication with forged or reused JWTs. CVE-2026-84388 is an improper authentication flaw in the Fortinet Privileged Access Agent Chrome extension that can allow attackers to proxy a user's browser traffic via a malicious website, requiring upgrades to both FortiPAM 1.9.1/1.8.4 and extension 8.0.1.123+. High-severity information disclosure in FortiSandbox (CVE-2026-26084) and man-in-the-middle risk in the FortiOS/FortiProxy Agentless ZTNA portal (CVE-2026-84393) were also fixed, alongside medium/low issues across FortiManager, FortiAnalyzer, FortiSOAR, FortiClient, FortiSIEM and others. Fortinet did not indicate any of the flaws are being exploited in the wild.

SecurityWeek · 6d agoVulnerability 2 sourcesCVE-2026-84390CVE-2026-84388CVE-2026-26084+1 CVEs

Fortinet security advisory (AV26-898)

Canadian Cyber Centre advisory AV26-898 flags Fortinet vulnerabilities across FortiOS, FortiProxy, FortiPAM, FortiSandbox and FortiMonitorOnSight, urging administrators to apply updates

The Canadian Centre for Cyber Security relayed Fortinet PSIRT advisories (AV26-898) listing vulnerabilities affecting FortiOS 7.6.1-7.6.6, FortiProxy 7.6.2-7.6.6, FortiPAM Chrome extensions 7.4/8.0, FortiSandbox 4.4 and 5.0, FortiSandbox Cloud and PaaS 5.0.4-5.0.5, and FortiMonitorOnSight 7.2. The bulletin does not detail individual CVEs or exploitation. Administrators and users are encouraged to review the linked Fortinet advisories and apply the necessary updates.

Canadian Centre for Cyber Security · 6d agoAdvisory 2 sources

FortiPAM Chrome Extension Vulnerability Lets Malicious Sites Control Browser Proxy and Record Tabs

Fortinet patched CVE-2026-84388 (CVSS 9.1) in its FortiPAM Chrome extension, letting malicious websites alter proxy settings, open tabs and record sessions.

The Fortinet FortiPAM Chrome extension flaw (CVE-2026-84388, CVSS 9.1) lets attacker-controlled domains be trusted as FortiPAM servers because a webRequest listener adds requested hostnames without verifying the initiator. A second issue exposes the extension's message interface to all URLs and accepts non-JWT tokens without validation, enabling unauthenticated session launches, proxy manipulation, tab control and recording; the consent dialog can also be bypassed via shadow-root clicks. Fortinet issued advisory FG-IR-26-168 after a July 17 report and released a fix on August 1, 2026, with no confirmed exploitation in the wild.

GBHackersupdated · 6d agofirst · 6d agoVulnerability 2 sourcesCVE-2026-84388

Related CVEs

  • CVE-2026-84388——
    —
  • CVE-2026-260849.9<1%
    Improper Access Control in Fortinet FortiSandbox Exposes Sensitive Data
    CVE-2026-26084 is an improper access control flaw (CWE-284) in the web interface of Fortinet's FortiSandbox threat-analysis product line, affecting on-premises 4.4.x and 5.0.x releases as well as the FortiSandbox Cloud and PaaS offerings. An unauthenticated attacker can trigger it remotely by sending crafted HTTP requests to the affected FortiSandbox web service, bypassing access controls without needing credentials or user interaction. A successful attacker gains access to sensitive information handled by the appliance; Fortinet's critical 9.9 CVSS score also reflects a scope change with a high availability-impact component, so defenders should treat the practical impact as potentially broader than simple information disclosure. Any organization running affected versions of FortiSandbox, FortiSandbox Cloud, or FortiSandbox PaaS is in scope, though the product's enterprise appliance/cloud deployment model means the affected population is far smaller than endpoint or firewall software. There is no evidence of exploitation so far: the flaw is not in CISA KEV, has no known public proof-of-concept, and EPSS assigns roughly a 0.2% probability of exploitation within 30 days.
    · Fortinet FortiSandbox 5.0.0 through 5.0.5 · Fortinet FortiSandbox 4.4.0 through 4.4.8moderate
  • CVE-2026-843909.8—
    Sensitive Information in Source Code in Fortinet FortiMonitorOnSight (CVSS 9.8)
    CVE-2026-84390 is a critical (CVSS 3.1: 9.8) information-disclosure flaw in Fortinet FortiMonitorOnSight in which sensitive information is included in the product's source code (CWE-540). An unauthenticated, network-located attacker who obtains that embedded material (e.g., secrets or credentials shipped with the code) can use it to gain improper access by subverting access controls; the CVSS vector requires no privileges or user interaction and rates the impact high on confidentiality, integrity, and availability. All FortiMonitorOnSight deployments running the affected 7.2.x releases listed by Fortinet (7.2.0 through 7.2.2 and 7.2.4 through 7.2.7) are affected. Fortinet has shipped fixes for this flaw, but there is no public proof-of-concept, the vulnerability is not in CISA KEV, and no exploitation in the wild is currently known.
    · Fortinet FortiMonitorOnSight 7.2.0 through 7.2.2 · Fortinet FortiMonitorOnSight 7.2.4 through 7.2.7niche
  • CVE-2026-843938.1<1%
    Certificate Host-Mismatch Validation Flaw in FortiOS and FortiProxy ZTNA
    CVE-2026-84393 is an improper certificate validation flaw (CWE-297, host mismatch) in the ZTNA (Zero Trust Network Access) functionality of Fortinet FortiOS and FortiProxy, in which certificates are not correctly verified against the intended host. Per the related advisory headline, a network-adjacent or on-path attacker can exploit it to perform a man-in-the-middle attack against ZTNA connections, and the vendor describes the impact as information disclosure; the CVSS vector additionally rates confidentiality, integrity, and availability impact as high. Organizations running affected FortiOS 7.6.1 through 7.6.6 or FortiProxy 7.6.2 through 7.6.6 with ZTNA enabled are exposed. As of now there is no known exploitation, no public proof-of-concept, the flaw is not in CISA's KEV catalog, and EPSS puts 30-day exploitation probability at just 0.2% (5th percentile), so risk is currently low but patching is still warranted given the high CVSS score.
    · Fortinet FortiOS 7.6.1 through 7.6.6 · Fortinet FortiProxy 7.6.2 through 7.6.6large

Appears with

vendor Fortinet 3product FortiMonitorOnSight 2product FortiOS 2product FortiProxy 2product FortiSandbox 2product FortiManager 1organization Am I Being Pwned 1product FortiSIEM 1product FortiSOAR 1organization Canadian Centre for Cyber Security 1organization Fortinet 1product FortiAnalyzer 1product FortiClient 1
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