WAF: Fortinet FortiSandbox path traversal protection and User-Agent rule update
Added new WAF rule to protect against CVE-2026-39813, a path traversal vulnerability in Fortinet FortiSandbox. Also transitioned the Fake Bing or MSN Bot User-Agent detection rule from Block to Disabled.
This release adds targeted coverage for a path traversal flaw in Fortinet FortiSandbox (CVE-2026-39813) and transitions the Anomaly:Header:User-Agent - Fake Bing or MSN Bot rule action from Block to Disabled.
Key Findings
- CVE-2026-39813: A path traversal vulnerability in Fortinet FortiSandbox allows remote, unauthenticated attackers to read arbitrary files from the underlying filesystem due to insufficient validation of user-supplied input paths.
| Ruleset | Rule ID | Legacy Rule ID | Description | Previous Action | New Action | Comments |
|---|---|---|---|---|---|---|
| Cloudflare Managed Ruleset | ...d84c92c9 | N/A | Fortinet FortiSandbox - Path Traversal - CVE:CVE-2026-39813 | Log | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...c12cf9c8 | N/A | Anomaly:Header:User-Agent - Fake Bing or MSN Bot | Enabled | Disabled | We are changing the action for this rule from BLOCK to Disabled |
Source: original entry ↗
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