CISA: Fortinet Releases Guidance to Address Ongoing Exploitation of Authentication Bypass Vulnerability CVE-2026-24858


Newly disclosed vulnerability Common Vulnerabilities and Exposures (CVE)-2026-24858 [Common Weakness Enumeration (CWE)-288: Authentication Bypass Using an Alternate Path or Channel] allows malicious actors with a FortiCloud account and a registered device to log in to separate devices registered to other users in FortiOS, FortiManager, FortiWeb, FortiProxy, and FortiAnalyzer, if FortiCloud single sign on (SSO) is enabled on devices.

Users are vulnerable to CVE-2026-24858 even if they updated Fortinet devices to address previously disclosed FortiCloud SSO bypass vulnerabilities CVE-2025-59718 and CVE-2025-59719 [CWE-347: Improper Verification of Cryptographic Signature]. CVE-2025-59718 and CVE-2025-59719 affect FortiOS, FortiWeb, FortiProxy, and FortiSwitch Manager, and allow malicious actors to bypass the SSO login authentication via a crafted Security Assertion Markup Language (SAML) message.

Read more…
Source: U.S. Cybersecurity and Infrastructure Security Agency


Sign up for the Cyber Security Review Newsletter
The latest cyber security news and insights delivered right to your inbox


Related:

  • Cisco warns of two more SD-WAN bugs under active attack

    March 6, 2026

    Just when network admins thought the Cisco SD-WAN patch queue might finally be shrinking, Switchzilla has confirmed miscreants are exploiting more vulnerabilities in its SD-WAN management software. The newly abused flaws affect Cisco Catalyst SD-WAN Manager, the platform formerly known as vManage that sits at the center of many organizations’ SD-WAN deployments. One of the bugs, ...

  • Kaspersky dismisses claims Coruna iPhone exploit kit is connected to NSA-linked operation

    March 4, 2026

    Russian cybersecurity outfit Kaspersky is waving away claims that an iPhone exploit kit recently uncovered by Google was developed by the same people who were behind a group of zero-days that allegedly compromised thousands of Russian diplomats in a 2023 campaign. After Google’s Threat Intelligence Group (GTIG) published its findings on the Coruna exploit kit this ...

  • Google patches 129 Android security flaws — including a potentially dangerous Qualcomm zero-day

    March 3, 2026

    Google has released a new security update which fixed 129 vulnerabilities in the Android ecosystem, including 10 critical-severity bugs, and one high-severity issue apparently being exploited in the wild. In a security advisory, Google said that it fixed a buffer over-read vulnerability in the Graphics component (an open-source Qualcomm module). The bug, tracked as CVE-2026-21385, was ...

  • Coruna: The Mysterious Journey of a Powerful iOS Exploit Kit

    March 3, 2026

    Google Threat Intelligence Group (GTIG) has identified a new and powerful exploit kit targeting Apple iPhone models running iOS version 13.0 (released in September 2019) up to version 17.2.1 (released in December 2023). The exploit kit, named “Coruna” by its developers, contained five full iOS exploit chains and a total of 23 exploits. The core technical ...

  • Chrome flaw let extensions hijack Gemini’s camera, mic, and file access

    March 3, 2026

    Chrome’s Gemini “Live in Chrome” panel (Gemini’s embedded, agent-style assistant mode within Chrome) had a high‑severity vulnerability tracked as CVE‑2026‑0628. The flaw let a low‑privilege extension inject code into the Gemini side panel and inherit its powerful capabilities, including local file access, screenshots, and camera/microphone control. The vulnerability was patched in a January update. But the ...

  • New AirSnitch attack bypasses Wi-Fi encryption in homes, offices, and enterprises

    February 26, 2026

    It’s hard to overstate the role that Wi-Fi plays in virtually every facet of life. The organization that shepherds the wireless protocol says that more than 48 billion Wi-Fi-enabled devices have shipped since it debuted in the late 1990s. New research shows that behaviors that occur at the very lowest levels of the network stack make ...