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This check seems robust, but it can still be bypassed by attackers.\n\n<img width=\"1606\" height=\"1346\" alt=\"QQ20260602-140205-2-2\" src=\"https://github.com/user-attachments/assets/83c549f3-38d7-444d-90f0-131d806f67ff\" />\n\nHere's the problem: Assuming the current website is `http://127.0.0.1:25222/`, if the attacker passes in a redirect URL of `http://127.0.0.1:25222//fushuling.com`, its host and schema are obviously the same as the current website, thus bypassing the verification. However, the issue lies in the final redirect URL, which is the path part of the URL, i.e., `//fushuling.com`. \n\nBrowsers automatically complete the HTTP header for URLs starting with `//`, ultimately successfully bypassing the restriction and redirecting to the external address `http://fushuling.com`.\n\nThis vulnerable behavior was successfully reproduced locally. Normally, specifying an external address directly will be blocked, so it will not redirect.\n\n<img width=\"1587\" height=\"717\" alt=\"QQ20260602-140756-2-3\" src=\"https://github.com/user-attachments/assets/51430c42-bd10-401b-9c9f-27a91a0bc648\" />\n\nHowever, if the redirect URL is `http://127.0.0.1:25222//fushuling.com`, the existing validation logic is bypassed, and the Location header is successfully set to `//fushuling.com`.\n\n```\nPOST /redirecttest/abc/frag HTTP/1.1\nHost: 127.0.0.1:25222\nReferer: http://127.0.0.1:25222//fushuling.com\nCache-Control: max-age=0\nsec-ch-ua: \"Not(A:Brand\";v=\"24\", \"Chromium\";v=\"122\"\nsec-ch-ua-mobile: ?0\nsec-ch-ua-platform: \"Windows\"\nUpgrade-Insecure-Requests: 1\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.6261.57 Safari/537.36\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7\nSec-Fetch-Site: none\nSec-Fetch-Mode: navigate\nSec-Fetch-User: ?1\nSec-Fetch-Dest: document\nAccept-Encoding: gzip, deflate, br\nAccept-Language: zh-CN,zh;q=0.9\nConnection: close\nContent-Type: application/x-www-form-urlencoded\nContent-Length: 0\n\n```\n<img width=\"1536\" height=\"729\" alt=\"QQ20260602-140925-2-4\" src=\"https://github.com/user-attachments/assets/31fde919-5f90-409f-8b14-af6c9c71761b\" />\n\nThe user was then successfully redirected to the external address `http://fushuling.com`.\n\n<img width=\"1692\" height=\"855\" alt=\"QQ20260602-141005-2-5\" src=\"https://github.com/user-attachments/assets/83b43ef6-52fa-4218-908b-7795394ae707\" />\n\n### PoC\n```\nhttp://127.0.0.1:25222//fushuling.com\n```\n\n### Impact\nOpen Redirect","state":0,"publishedAt":"2026-07-09T23:19:39+00:00","modifiedAt":"2026-07-21T19:18:54.7363413+00:00","affected":[{"ecosystem":"Go","name":"github.com/openrundev/openrun","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.17.7"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/openrundev/openrun/security/advisories/GHSA-h5g6-xmh4-hc37","https://github.com/openrundev/openrun/commit/709da784fcf1311c85f30f3542cfa3601a78bbf0","https://github.com/openrundev/openrun","https://github.com/openrundev/openrun/releases/tag/v0.17.7"],"sourceUrl":"https://github.com/advisories/GHSA-h5g6-xmh4-hc37","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-h5g6-xmh4-hc37","identifiers":["GHSA-h5g6-xmh4-hc37","CVE-2026-55252","GO-2026-5956"]},"retained":false,"historicalAffected":[]},{"revision":"9957311832d84a178462c5cf79cbaedc","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5956","aliases":["CVE-2026-55252","GHSA-h5g6-xmh4-hc37"],"title":"OpenRun: Redirect URL validation bypass using \u00A0//host\u00A0 paths leads to Open Redirect in github.com/openrundev/openrun","description":"OpenRun: Redirect URL validation bypass using \u00A0//host\u00A0 paths leads to Open Redirect in github.com/openrundev/openrun","state":0,"publishedAt":"2026-07-17T19:42:05+00:00","modifiedAt":"2026-07-21T19:15:27.7885436+00:00","affected":[{"ecosystem":"Go","name":"github.com/openrundev/openrun","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.17.7"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/openrundev/openrun/security/advisories/GHSA-h5g6-xmh4-hc37","https://github.com/openrundev/openrun/commit/709da784fcf1311c85f30f3542cfa3601a78bbf0","https://github.com/openrundev/openrun/releases/tag/v0.17.7"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5956","license":"OSV · upstream source license applies","key":"osv:GO-2026-5956","identifiers":["GO-2026-5956","CVE-2026-55252","GHSA-h5g6-xmh4-hc37"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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