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Authenticated SQL Injection in Fortinet FortiDDoS-F REST API

IdentifiersCVE-2026-39815CWE-89· Improper Neutralization of Special…

CVE-2026-39815 is an authenticated SQL injection vulnerability in the REST API of Fortinet FortiDDoS-F affecting versions 7.2.1 through 7.2.2. The flaw is caused by improper neutralization of special elements used in SQL commands, allowing user-supplied input from crafted HTTP API requests to be incorporated into backend SQL queries without proper sanitization or parameterization. According to the available content, exploitation requires a valid authenticated session using the product’s bearer-token-based API authentication. A successful attacker can execute arbitrary SQL queries against the appliance’s backend database. The specific vulnerable endpoint or parameter has not been publicly disclosed in the provided material. Fortinet fixed the issue in version 7.2.3 and later.

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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 an authenticated attacker to execute arbitrary SQL against the FortiDDoS-F backend database. This can expose sensitive configuration data, permit unauthorized modification of protection profiles and other stored settings, and undermine the integrity and availability of the DDoS mitigation appliance. The provided CVSS v3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) indicates high confidentiality, integrity, and availability impact.

Mitigation

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

If immediate upgrade is not possible, reduce exposure by disabling the REST API where operationally feasible or strictly restricting access to it. Limit API reachability to trusted administrative networks, enforce least-privilege access for accounts permitted to use the API, protect and rotate bearer tokens, and monitor API activity and appliance logs for suspicious crafted requests or anomalous configuration/database access. Because exploitation requires authenticated API access, tightening authentication and network exposure materially reduces risk.

Remediation

Patch, then assume compromise.

Upgrade FortiDDoS-F to version 7.2.3 or later, which contains Fortinet’s fix for CVE-2026-39815. Versions 7.2.1 through 7.2.2 are affected. The provided content states that 7.0, 6.6, 6.5, 6.4, and 6.3 releases are not affected. Review Fortinet PSIRT advisory FG-IR-26-119 for vendor guidance and any product-specific upgrade instructions.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

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
FortinetFortiddos-Foperating_system

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What this page doesn’t show

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

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

Social activity4

Community discussion across Reddit, Mastodon, and other social sources.