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Gitea before 1.4.3 is affected by URL Redirection to Untrusted Site ('Open Redirect') via internal URLs.
Use CWE-601, Gitea vendor hub and Gitea product page to widen CVE-2021-45328 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-20912, CVE-2026-20897 and CVE-2026-20750 for nearby disclosures in the same product family.