# CVE-2026-24858: Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel > Attackers with FortiCloud accounts can bypass authentication to access other users' devices if FortiCloud SSO is enabled. - **Severity:** Critical 9.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C`) - **Exploited in the wild:** Yes, since 27 Jan 2026 (CISA KEV) - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** No - **Published:** 27 Jan 2026 - **Updated:** 9 Jun 2026 - **Also known as:** GHSA-2x38-48vp-w23x ## What is CVE-2026-24858? CVE-2026-24858 is a critical authentication bypass vulnerability in Fortinet Fortianalyzer, published on 27 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] vulnerability in Fortinet FortiAnalyzer 7.6.0 through 7.6.5, FortiAnalyzer 7.4.0 through 7.4.9, FortiAnalyzer 7.2.0 through 7.2.11, FortiAnalyzer 7.0.0 through 7.0.15, FortiManager 7.6.0 through 7.6.5, FortiManager 7.4.0 through 7.4.9, FortiManager 7.2.0 through 7.2.11, FortiManager 7.0.0 through 7.0.15, FortiNAC-F 7.6.3 through 7.6.5, FortiOS 7.6.0 through 7.6.5, FortiOS 7.4.0 through 7.4.10, FortiOS 7.2.0 through 7.2.12, FortiOS 7.0.0 through 7.0.18, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4.0 through 7.4.12, FortiProxy 7.2.0 through 7.2.15, FortiProxy 7.0.0 through 7.0.22, FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11 may allow an attacker with a FortiCloud account and a registered device to log into other devices registered to other accounts, if FortiCloud SSO authentication is enabled on those devices. Weakness: CWE-288 (Authentication Bypass Using an Alternate Path or Channel) ## Which versions are affected by CVE-2026-24858? It affects 7 products. Products: Fortinet Fortianalyzer, Fortinet Fortimanager, Fortinet Fortinac-F, Fortinet Fortios, Fortinet Fortiproxy, Fortinet Fortiweb, Siemens Ruggedcom Ape1808 Firmware. ## How do I fix CVE-2026-24858? No fix has been published for CVE-2026-24858 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 30 Jan 2026. ## Is CVE-2026-24858 being exploited? Yes. Attackers have exploited CVE-2026-24858 in the wild since at least 27 Jan 2026. Public exploit code: - CVE-2026-24858 FortiCloud Single Sign On (SSO) a factory default enabled feature once you register any FortiGate/FortiManager/FortiAnalyzer contains a critical authentication bypass flaw. (github_poc): https://github.com/absholi7ly/CVE-2026-24858-FortiCloud-SSO-Authentication-Bypass - CVE-2026-24858 - Administrative FortiCloud SSO authentication bypass (github_poc): https://github.com/gagaltotal/cve-2026-24858 - 아직 제로데이인거 같아, 공개되거나 천천히 분석할 예정.... (github_poc): https://github.com/m0d0ri205/CVE-2026-24858 - A Proof-of-Concept demonstrating the application of 3D Navier-Stokes CTT formulations to packet flow optimization and defensive bypass. (github_poc): https://github.com/SimoesCTT/-CTT-NSP-Convergent-Time-Theory---Network-Stack-Projection-CVE-2026-24858- - While Fortinet's January 27, 2026 mitigation for **CVE-2026-24858** focuses on blocking specific accounts like `cloud-noc@mail.io`, it fails to address the **Temporal Vulnerability** of the SAML state machine. (github_poc): https://github.com/SimoesCTT/SCTT-2026-33-0004-FortiCloud-SSO-Identity-Singularity ## Other vulnerabilities in Fortinet Fortianalyzer - [CVE-2023-25610](https://insights.sbomify.com/CVE-2023-25610/): Memory corruption in FortiAnalyzer (critical 9.3) - [CVE-2021-32603](https://insights.sbomify.com/CVE-2021-32603/): Server-side request forgery in Fortinet FortiAnalyzer, FortiManager (high 8.8) - [CVE-2020-12817](https://insights.sbomify.com/CVE-2020-12817/): Cross-site scripting in Fortinet FortiAnalyzer (high 8.8) - [CVE-2024-48886](https://insights.sbomify.com/CVE-2024-48886/): Auth bypass in FortiOS (high 8.0) - [CVE-2022-39950](https://insights.sbomify.com/CVE-2022-39950/): Cross-site scripting in Fortinet FortiAnalyzer, FortiManager (high 8.0) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-24858 and fix it if it is affected. What it is: CVE-2026-24858 is a critical authentication bypass vulnerability in Fortinet Fortianalyzer, published on 27 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: Yes. Attackers have exploited CVE-2026-24858 in the wild since at least 27 Jan 2026. Affected product: Fortinet Fortianalyzer. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-24858/ (Markdown: https://insights.sbomify.com/CVE-2026-24858/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-24858 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-24858 - OSV: https://osv.dev/vulnerability/CVE-2026-24858 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-24858/ Summaries are generated and may contain mistakes; the official description above is the record.