High

Authentication rate-limit bypass in Fortinet FortiWeb

IdentifiersCVE-2026-24017CWE-799· Improper Control of Interaction…

CVE-2026-24017 is an Improper Control of Interaction Frequency vulnerability in Fortinet FortiWeb. Affected versions are FortiWeb 8.0.0 through 8.0.2, 7.6.0 through 7.6.5, 7.4.0 through 7.4.10, 7.2.0 through 7.2.11, and 7.0.0 through 7.0.11. The flaw allows a remote, unauthenticated attacker to bypass the product's authentication rate-limiting protections by sending crafted requests. Based on the available information, the issue is in the enforcement of request throttling around authentication attempts rather than in credential validation itself, enabling repeated login attempts beyond intended limits.

For your environment

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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 unauthenticated remote attacker to evade authentication rate-limiting controls and perform a higher volume of authentication attempts than intended. This materially increases the feasibility of password-guessing and brute-force attacks against FortiWeb accounts. The ultimate impact depends on the attacker's available resources and the complexity and strength of the targeted password; if valid credentials are guessed, this could lead to unauthorized access to the affected FortiWeb instance.

Mitigation

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

Until patches can be applied, reduce exposure of FortiWeb authentication interfaces to untrusted networks, restrict administrative access with network ACLs or VPN-only access, and enforce strong passwords and MFA where supported. Additional compensating controls include external rate-limiting or WAF rules in front of the authentication endpoint, account lockout monitoring, and alerting on repeated authentication attempts from the same or distributed sources.

Remediation

Patch, then assume compromise.

Upgrade FortiWeb to a fixed release provided by Fortinet. The vulnerable ranges are 8.0.0 through 8.0.2, 7.6.0 through 7.6.5, 7.4.0 through 7.4.10, 7.2.0 through 7.2.11, and 7.0.0 through 7.0.11. Organizations should apply the vendor patch or move to a version outside these affected ranges as soon as operationally feasible.

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

FortinetFortiwebapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

3 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

3 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

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 activity2