Medium

Gitea OpenID account linking without session binding

Type: advisorySources: OSV

The Gitea OpenID association callback in the security settings accepted a positive OpenID 2.0 assertion without checking that the signed-in user had started the linking. Because OpenID 2.0 allows unsolicited assertions, an attacker-controlled OpenID provider could attach the attacker's identity to the account of a signed-in victim who opened a crafted link, and the attacker could then sign in as the victim through OpenID login, which does not apply the local TOTP or WebAuthn checks. The callback now requires a time-limited `state` value bound to the user.

Products: Not specified
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2026-104627
Confirmed fixed CVEs: Not specified
Updated in this feed: 3 Nov 2026, 11:32 UTC · Revision 1

Source evidence

Gitea OpenID account linking without session binding

core-osv · Original source

Published 18 Oct 2026, 18:51 UTC

osv:CVE-2026-104627

Complete source record

{
  "id": "cda086612b25556bb21745e840e4bc29802b34237bfc95c1bddd01cffdaf1598",
  "url": "https://osv.dev/vulnerability/CVE-2026-104627",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Gitea OpenID account linking without session binding",
    "summary": "The Gitea OpenID association callback in the security settings accepted a positive OpenID 2.0 assertion without checking that the signed-in user had started the linking. Because OpenID 2.0 allows unsolicited assertions, an attacker-controlled OpenID provider could attach the attacker's identity to the account of a signed-in victim who opened a crafted link, and the attacker could then sign in as the victim through OpenID login, which does not apply the local TOTP or WebAuthn checks. The callback now requires a time-limited `state` value bound to the user.",
    "evidence": "osv:CVE-2026-104627",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-104627",
      "aliases": [
        "CVE-2026-104627",
        "GHSA-mf69-7pqq-86vx"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/go-gitea/gitea",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "829b49c1ae96015e345f9d2a0eb1ea7acd5f31e1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "28.1.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "829b49c1ae96015e345f9d2a0eb1ea7acd5f31e1"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v28.2.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v28.1.0",
            "v28.0.0",
            "v29.0.0-dev",
            "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",
            "v1.15.0-rc1",
            "v1.16.0-dev",
            "v1.15.0-dev",
            "v1.14.0-dev",
            "v1.13.0-dev",
            "v1.12.0-dev",
            "v1.10.5",
            "v1.11.0-rc1",
            "v1.10.0-rc1",
            "v1.11.0-dev",
            "v1.9.0-rc1",
            "v1.10.0-dev",
            "v1.9.0-dev",
            "v1.7.0-dev",
            "v1.6.0-rc1",
            "v1.6.0-dev",
            "v1.5.0-rc1",
            "v1.5.0-dev",
            "v1.1.0",
            "v1.0.0",
            "v0.9.99"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-104627.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.269773082Z",
      "provider": "osv",
      "references": [
        "https://blog.gitea.com/release-of-28.2.0/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104627.json",
        "https://github.com/go-gitea/gitea/releases/tag/v28.2.0",
        "https://github.com/go-gitea/gitea/security/advisories/GHSA-mf69-7pqq-86vx",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-104627",
        "https://github.com/go-gitea/gitea/pull/39642",
        "https://github.com/go-gitea/gitea/pull/39744"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-287",
          "CWE-352"
        ],
        "cna_assigner": "Gitea",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104627.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-104627",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494993,
  "published_at": "2026-10-18T18:51:06.543+00:00"
}