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Mallory
Medium

Arbitrary Directory Deletion in FortiSandbox vmimages delete Feature

IdentifiersCVE-2026-25691CWE-22· Improper Limitation of a Pathname…

CVE-2026-25691 is a path traversal vulnerability in the FortiSandbox vmimages delete feature affecting FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, all versions of FortiSandbox 4.2, FortiSandbox Cloud 5.0.4, and FortiSandbox PaaS 5.0.4. Due to improper limitation of a pathname to a restricted directory, a privileged attacker can supply crafted HTTP requests that cause the product to operate on directories outside the intended scope. The issue specifically enables deletion of arbitrary directories. Available reporting indicates exploitation requires a super-admin profile and CLI access; one mention context also describes the attacker as an authenticated GUI user targeting the vmimages delete functionality.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows deletion of arbitrary directories on the affected FortiSandbox system. This can cause destructive impact to application data, system files, or service components, potentially resulting in service disruption, loss of forensic or sandbox artifacts, instability, or broader compromise of the appliance’s integrity depending on what directories are removed.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, restrict access to FortiSandbox administrative interfaces and APIs to trusted management networks only, minimize the number of accounts with super-admin privileges, tightly control and monitor CLI access, and audit HTTP requests and administrative actions involving the vmimages delete feature for anomalous path values or unexpected deletion activity. Because exploitation requires privileged access, enforcing least privilege and reducing exposure of management surfaces are the primary mitigations.

Remediation

Patch, then assume compromise.

Upgrade FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS to vendor-fixed releases identified by Fortinet for CVE-2026-25691. Affected versions listed in the provided content are FortiSandbox 5.0.0 through 5.0.5, 4.4.0 through 4.4.8, all 4.2 versions, FortiSandbox Cloud 5.0.4, and FortiSandbox PaaS 5.0.4. Review Fortinet PSIRT guidance for the exact patched versions and apply the vendor update on all affected deployments.
PUBLIC EXPLOITS

Exploits

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VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
FortinetFortisandboxapplication
FortinetFortisandbox Cloudapplication
FortinetFortisandboxcloudapplication
FortinetFortisandboxpaasapplication

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What this page doesn’t show

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Threat actor evidence

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Associated malware

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Detection signatures

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Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

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