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Open Redirect Bugs: How Attackers Abuse Trusted Domains and How to Fix Them

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An open redirect occurs when an endpoint forwards users to any URL supplied in a parameter, letting attackers borrow a site's domain trust. This can enable phishing links that pass domain-based checks, and token theft during OAuth or SSO flows. The article's author ran a local test server showing that naive checks fail against bypass payloads such as protocol-relative URLs and backslash tricks. The recommended fix is an allowlist of same-origin paths or exact hostnames, validated with a real URL parser and a safe default fallback. The author also suggests a strict Referrer-Policy for sensitive pages to prevent token leakage.

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