CVE-2026-63770: Insecure Xff Leftmost Ip
Extracting the leftmost IP address from the X-Forwarded-For (or similar) header by accessing index `0` after splitting by `,`. The leftmost IP address is set by the client and can be easily spoofed, leading to rate limit or authentication bypass mechanisms. Rely on the rightmost IP address added by the trusted proxy instead (e.g., `ips[len(ips)-1]`).
Gogreprules fetch cve-2026-63770-insecure-xff-leftmost-ip --engine opengrepDescription
Extracting the leftmost IP address from the X-Forwarded-For (or similar) header by accessing index `0` after splitting by `,`. The leftmost IP address is set by the client and can be easily spoofed, leading to rate limit or authentication bypass mechanisms. Rely on the rightmost IP address added by the trusted proxy instead (e.g., `ips[len(ips)-1]`).
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