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Critical

Gitea WebAuthn bypass during OAuth and OIDC sign-in

Type: advisorySources: OSV

Gitea's OAuth2 and OpenID Connect sign-in paths do not require a WebAuthn challenge when WebAuthn is the account's only configured second factor. A party able to authenticate through the affected external identity flow can obtain a full session without the passkey verification enforced during password login. One affected path can also persist an external identity link, extending the compromise beyond the initial session; accounts with TOTP configured are outside the reported WebAuthn-only scenario.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-73278
Confirmed fixed CVEs
Not specified
Updated in this feed
8 Nov 2026, 00:23 UTC · Revision 1

Source evidence

Gitea WebAuthn bypass during OAuth and OIDC sign-in

core-osv · Original source

Published 6 Oct 2026, 19:33 UTC

Gitea's OAuth2 and OpenID Connect sign-in paths do not require a WebAuthn challenge when WebAuthn is the account's only configured second factor. A party able to authenticate through the affected external identity flow can obtain a full session without the passkey verification enforced during password login. One affected path can also persist an external identity link, extending the compromise beyond the initial session; accounts with TOTP configured are outside the reported WebAuthn-only scenario.

osv:CVE-2026-73278
Complete source record
{
  "id": "ccce9d376e52431e612fab563243b0d58e12eb5a93a853d31b6e3d43d8762d69",
  "url": "https://osv.dev/vulnerability/CVE-2026-73278",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Gitea WebAuthn bypass during OAuth and OIDC sign-in",
    "summary": "Gitea's OAuth2 and OpenID Connect sign-in paths do not require a WebAuthn challenge when WebAuthn is the account's only configured second factor. A party able to authenticate through the affected external identity flow can obtain a full session without the passkey verification enforced during password login. One affected path can also persist an external identity link, extending the compromise beyond the initial session; accounts with TOTP configured are outside the reported WebAuthn-only scenario.",
    "evidence": "osv:CVE-2026-73278",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-73278",
      "aliases": [
        "BIT-gitea-2026-73278",
        "CVE-2026-73278",
        "GHSA-92j2-6qcg-c28c"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/go-gitea/gitea",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8df3d6575a3e07d38b264e5c1581e48aa4a02c88"
                },
                {
                  "fixed": "1dac1bb2f8593d4319125fa6bca9283000a2ddc2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:gitea:gitea:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.16.0"
                      },
                      {
                        "fixed": "1.27.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1dac1bb2f8593d4319125fa6bca9283000a2ddc2"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.27.2"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.27.1",
            "v1.27.0",
            "v1.27.0-rc0",
            "v1.28.0-dev",
            "v1.27.0-dev",
            "v1.26.0-dev",
            "v1.25.0-dev",
            "v1.24.0-dev",
            "v1.22.0-rc1",
            "v1.23.0-dev",
            "v1.22.0-rc0",
            "v1.21.0-rc0",
            "v1.22.0-dev",
            "v1.20.0-rc0",
            "v1.21.0-dev",
            "v1.20.0-dev",
            "v1.19.0-rc0",
            "v1.18.0-rc0",
            "v1.19.0-dev",
            "v1.18.0-dev",
            "v1.17.0-dev",
            "v1.16.0-rc1",
            "v1.16.0-dev"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73278.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.112046746Z",
      "provider": "osv",
      "references": [
        "https://blog.gitea.com/release-of-1.27.2/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73278.json",
        "https://github.com/go-gitea/gitea/releases/tag/v1.27.2",
        "https://github.com/go-gitea/gitea/security/advisories/GHSA-92j2-6qcg-c28c",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-73278",
        "https://github.com/go-gitea/gitea/pull/38805",
        "https://github.com/go-gitea/gitea/pull/38810"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-287"
        ],
        "cna_assigner": "Gitea",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73278.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-73278",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520934,
  "published_at": "2026-10-06T19:33:54.375+00:00"
}