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Critical

Gitea: Cross-Repository Authorization Bypass via Release Attachment Linking Leads to Private Attachment Disclosure

Type: advisorySources: OSV

Gitea does not properly validate repository ownership when linking attachments to releases. An attachment uploaded to a private repository could potentially be linked to a release in a different public repository, making it accessible to unauthorized users.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-20912
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 06:43 UTC · Revision 1

Source evidence

Gitea: Cross-Repository Authorization Bypass via Release Attachment Linking Leads to Private Attachment Disclosure

core-osv · Original source

Published 22 Jan 2026, 22:01 UTC

Gitea does not properly validate repository ownership when linking attachments to releases. An attachment uploaded to a private repository could potentially be linked to a release in a different public repository, making it accessible to unauthorized users.

osv:CVE-2026-20912
Complete source record
{
  "id": "69f003aa0d321b3222fe954356834e073083b5435a57ceb9fee27a6e4599cf1c",
  "url": "https://osv.dev/vulnerability/CVE-2026-20912",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Gitea: Cross-Repository Authorization Bypass via Release Attachment Linking Leads to Private Attachment Disclosure",
    "summary": "Gitea does not properly validate repository ownership when linking attachments to releases. An attachment uploaded to a private repository could potentially be linked to a release in a different public repository, making it accessible to unauthorized users.",
    "evidence": "osv:CVE-2026-20912",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-20912",
      "aliases": [
        "BIT-gitea-2026-20912",
        "CVE-2026-20912",
        "GHSA-4xx9-vc8v-87hv",
        "GHSA-vfmv-f93v-37mw",
        "GO-2026-4364"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/go-gitea/gitea",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "369830bada2fd8826a5135cb2fc66660a9bef708"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:gitea:gitea:*:*:*:*:*:-:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.25.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "369830bada2fd8826a5135cb2fc66660a9bef708"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.25.4"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.25.3",
            "v1.25.2",
            "v1.25.1",
            "v1.25.0",
            "v1.25.0-rc0",
            "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-2026-20912.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.960132959Z",
      "provider": "osv",
      "references": [
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-20912.json",
        "https://access.redhat.com/security/cve/CVE-2026-20912",
        "https://blog.gitea.com/release-of-1.25.4/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/20xxx/CVE-2026-20912.json",
        "https://github.com/go-gitea/gitea/releases/tag/v1.25.4",
        "https://github.com/go-gitea/gitea/security/advisories/GHSA-vfmv-f93v-37mw",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-20912",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2432219",
        "https://github.com/go-gitea/gitea/pull/36320",
        "https://github.com/go-gitea/gitea/pull/36355"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-284",
          "CWE-639"
        ],
        "cna_assigner": "Gitea",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/20xxx/CVE-2026-20912.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-20912",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518536,
  "published_at": "2026-01-22T22:01:52.026+00:00"
}