Fortinet FortiClientMac: critical vulnerability

Fortinet FortiClientMac

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.

Do this now

Upgrade FortiClientMac to 7.4.8 and FortiClientWindows to 7.4.8 or 7.2.15, plus the +2 more lines in Fix it.

Who should check: teams running VPN & firewalls

Fix it

FortiClientMac

Upgrade to FortiClientMac 7.4.8

FortiClientWindows

On 7.2.xUpgrade to FortiClientWindows 7.2.15
On 7.4.xUpgrade to FortiClientWindows 7.4.8

FortiClientWindowsPAM

On 7.2.xUpgrade to FortiClientWindowsPAM 7.2.15
On 7.4.xUpgrade to FortiClientWindowsPAM 7.4.8

First seen: 11 Nov 2026
Last update: 11 Nov 2026, 14:18 UTC
Fixed in: FortiClientMac 7.4.8
FortiClientWindows 7.4.8
FortiClientWindows 7.2.15
FortiClientWindowsPAM 7.4.8
FortiClientWindowsPAM 7.2.15
Identifiers: CVE-2026-121529
CVSS: 9.1
Source: news
On the menu as: VPN & firewalls

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Fortinet FortiClientMac: critical vulnerability
Severity: critical. Patch status: patched.
Affected: Fortinet FortiClientMac
Fixed in: FortiClientMac 7.4.8, FortiClientWindows 7.4.8, FortiClientWindows 7.2.15, FortiClientWindowsPAM 7.4.8, FortiClientWindowsPAM 7.2.15
Ids: 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.

## Steps
1. This touches infrastructure (vpn-edge). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.
2. Fix by release line: FortiClientMac: 7.4.x → 7.4.8. FortiClientWindows: 7.4.x → 7.4.8; 7.2.x → 7.2.15. FortiClientWindowsPAM: 7.4.x → 7.4.8; 7.2.x → 7.2.15.

## Fix by release line
| Line | State | Fix | Until then |
|---|---|---|---|
| FortiClientMac 7.4.x | fixed | 7.4.8 | — |
| FortiClientWindows 7.4.x | fixed | 7.4.8 | — |
| FortiClientWindows 7.2.x | fixed | 7.2.15 | — |
| FortiClientWindowsPAM 7.4.x | fixed | 7.4.8 | — |
| FortiClientWindowsPAM 7.2.x | fixed | 7.2.15 | — |

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-121529") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://fortiguard.fortinet.com/psirt/FG-IR-26-194 https://nvd.nist.gov/vuln/detail/CVE-2026-121529
https://pwned.coffee/i/fortinet-forticlientmac-7-4-0-critical-vulnerability-cve-2026-121529

Timeline

11 Nov 2026, 14:18 UTC
Fix status: unknown → patched.
11 Nov 2026
First reported.

Receipt

Exploitation: No known exploitation
Fix by release line: Product Affected Fixed in Source
FortiClientMac <= 7.4.7 7.4.8 Vendor advisory checked 11 Nov
FortiClientWindows <= 7.4.7 7.4.8 Vendor advisory checked 11 Nov
FortiClientWindows <= 7.2.14 7.2.15 Vendor advisory checked 11 Nov
FortiClientWindowsPAM <= 7.4.7 7.4.8 Vendor advisory checked 11 Nov
FortiClientWindowsPAM <= 7.2.14 7.2.15 Vendor advisory checked 11 Nov
Score: CVSS 9.1 (critical). CVSS 3.1 9.1 (CNA fortinet) for CVE-2026-121529
Last checked: 13 Nov 2026, 16:26 UTC

Product	Affected	Fixed in	Source
FortiClientMac	<= 7.4.7	7.4.8	Vendor advisory checked 11 Nov
FortiClientWindows	<= 7.4.7	7.4.8	Vendor advisory checked 11 Nov
FortiClientWindows	<= 7.2.14	7.2.15	Vendor advisory checked 11 Nov
FortiClientWindowsPAM	<= 7.4.7	7.4.8	Vendor advisory checked 11 Nov
FortiClientWindowsPAM	<= 7.2.14	7.2.15	Vendor advisory checked 11 Nov

Sources: KEV – CVE record ✓ Vendor ✓

Sources

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