Is there a public exploit for CVE-2026-121529?

Yes. Proof-of-concept code for CVE-2026-121529 has been published publicly.

Is there a proof of concept for CVE-2026-121529?

Yes — 4 proof-of-concept entries are linked on this page, from public repositories and community submissions. They are listed for authorised testing only.

How severe is CVE-2026-121529?

CVE-2026-121529 scores CVSS 9.1 (v3.1), rated critical.

What does CVE-2026-121529 affect?

CVE-2026-121529 affects Fortinet FortiClientMac, FortiClientWindowsPAM, FortiClientWindows.

9.1 Critical

A origin validation error vulnerability in Fortinet FortiClientMac 7.4.0 through 7.4.7, FortiClientWindows 7.4.0 through 7.4.7,…

CVE-2026-121529

A origin validation error vulnerability in Fortinet FortiClientMac 7.4.0 through 7.4.7, FortiClientWindows 7.4.0 through 7.4.7, FortiClientWindows 7.2.0 through 7.2.14, FortiClientWindowsPAM 7.4.7, FortiClientWindowsPAM 7.2.14 may allow an unauthorized remote attacker to execute unauthorized code or commands. Successful exploitation requires interaction with the victim.

Proof-of-concept code is published

Public PoC

Public PoCashrafzaryouh/CVE-2026-1215291 stars
Public PoCgooglesky/CVE-2026-121529
Public PoCgooglesky/Fortinet2Shell
Public PoCGhost-Bx1/cve-2026-121529-forticlient-cors-rce

Signals come from Exploit-DB, Metasploit, Nuclei and published proof-of-concept repositories. Their absence means nothing was found, not that nothing exists.

Assessment

CVSS: 9.1 (v3.1)
Severity: Critical
Known exploited: Not listed in CISA KEV
Exploit availability: Public PoC
Published: 10 November 2026
Last updated: 12 November 2026
Affected: Fortinet · FortiClientMac · FortiClientWindows · FortiClientWindowsPAM
Assigner: fortinet

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C

At the source

EUVD (ENISA)

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-194

Community proofs of concept

No community proof of concept yet. If you have one for a published vulnerability and the right to share it, add it below — it will appear here once reviewed.

Submit a proof of concept

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Before you submit * This vulnerability is already publicly disclosed (it has a published CVE). This material comes only from testing I was authorised to perform. I have the legal right to publish this content and am not breaching any agreement by doing so. It contains no live credentials, personal data, or anything targeting systems I am not authorised to test. I understand it will be reviewed before it appears publicly and may be rejected. I agree to the submission terms.

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Query this programmatically

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