{"id":"CVE-2026-82402","summary":"Gogs: Open Redirect in /redirect endpoint via backslash bypass in `IsSameSite`","details":"Gogs is an open source self-hosted Git service. Prior to 0.15.0+dev, an unauthenticated attacker can provide a backslash-containing target to the /redirect endpoint, and similar post-action redirect flows are also affected. internal/urlx/urlx.go IsSameSite validates a normalized form of the target while cmd/gogs/internal/web/web.go getRedirect and other callers use the original value in the Location response. This backslash normalization mismatch lets browsers interpret the Location value as a scheme-relative external URL, allowing links on a trusted Gogs domain to redirect victims to attacker-controlled content for phishing. This vulnerability is fixed in 0.15.0+dev.","aliases":["GHSA-3g28-2vwg-gxq6"],"modified":"2026-10-16T02:47:49.407658724Z","published":"2026-10-14T18:49:19.768Z","database_specific":{"cwe_ids":["CWE-601"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82402.json","unresolved_ranges":[{"extracted_events":[{"introduced":"\u003c 0.15.0+dev"},{"last_affected":"\u003c 0.15.0+dev"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/gogs/gogs/blob/main/CHANGELOG.md#0150dev-main"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82402.json"},{"type":"ADVISORY","url":"https://github.com/gogs/gogs/security/advisories/GHSA-3g28-2vwg-gxq6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-82402"},{"type":"FIX","url":"https://github.com/gogs/gogs/commit/0aa820e6d572771551871c0b5f5f32dffc565e3e"},{"type":"FIX","url":"https://github.com/gogs/gogs/pull/8391"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/gogs/gogs","events":[{"introduced":"0"},{"fixed":"0aa820e6d572771551871c0b5f5f32dffc565e3e"}],"database_specific":{"source":"REFERENCES"}}],"versions":["latest-commit-build","v0.11.91","v0.11.86","v0.11.79","v0.11.66","v0.11.53","v0.11.43","v0.11.34","v0.11.33","v0.11.29","v0.11.19","v0.11.4","v0.11","v0.11rc","v0.10.18","v0.10.8","v0.10","v0.10rc","v0.9.141","v0.9.128","v0.9.113","v0.9.97","v0.9.71","v0.9.60","v0.9.48","v0.9.46","v0.9.13","v0.9.0","v0.8.43","v0.8.25","v0.8.10","v0.8.0","v0.7.33","v0.7.22","v0.7.19","v0.7.6","v0.7.0","v0.6.15","v0.6.9","v0.6.3","v0.6.1","v0.5.13","v0.5.11","v0.5.9","v0.5.8","v0.5.5","v0.5.2","v0.5.0","v0.4.2","v0.4.1","v0.4.0","v0.3.1","v0.3.0","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82402.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"}]}