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Gitea reusable workflow secret exposure in pull_request_target

Type: advisorySources: OSV

Gitea resolves local reusable workflow files from a fork's head commit when a trusted base-branch workflow runs for a pull_request_target event. A fork author can modify a referenced reusable workflow so attacker-controlled code executes with the repository and organization secrets available to that event. Exploitation requires a base workflow that calls a local reusable workflow, and bypasses the intended separation between trusted base code and untrusted fork code.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-73800
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 03:38 UTC · Revision 1

Source evidence

Gitea reusable workflow secret exposure in pull_request_target

core-osv · Original source

Published 14 Oct 2026, 14:37 UTC

Gitea resolves local reusable workflow files from a fork's head commit when a trusted base-branch workflow runs for a pull_request_target event. A fork author can modify a referenced reusable workflow so attacker-controlled code executes with the repository and organization secrets available to that event. Exploitation requires a base workflow that calls a local reusable workflow, and bypasses the intended separation between trusted base code and untrusted fork code.

osv:CVE-2026-73800
Complete source record
{
  "id": "a4753d2596738f886732e80d0f84fc0b9ee1a38f356d80dc71560aebe7efd4f5",
  "url": "https://osv.dev/vulnerability/CVE-2026-73800",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Gitea reusable workflow secret exposure in pull_request_target",
    "summary": "Gitea resolves local reusable workflow files from a fork's head commit when a trusted base-branch workflow runs for a pull_request_target event. A fork author can modify a referenced reusable workflow so attacker-controlled code executes with the repository and organization secrets available to that event. Exploitation requires a base workflow that calls a local reusable workflow, and bypasses the intended separation between trusted base code and untrusted fork code.",
    "evidence": "osv:CVE-2026-73800",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-73800",
      "aliases": [
        "CVE-2026-73800",
        "GHSA-r9ch-mqjm-g67v"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/go-gitea/gitea",
              "type": "GIT",
              "events": [
                {
                  "introduced": "49a4e4555a8af51f5a83ee321607c328930c070e"
                },
                {
                  "fixed": "1dac1bb2f8593d4319125fa6bca9283000a2ddc2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.19.0"
                      },
                      {
                        "fixed": "1.27.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "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",
            "v1.19.0-dev"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73800.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.738108840Z",
      "provider": "osv",
      "references": [
        "https://blog.gitea.com/release-of-1.27.2/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73800.json",
        "https://github.com/go-gitea/gitea/releases/tag/v1.27.2",
        "https://github.com/go-gitea/gitea/security/advisories/GHSA-r9ch-mqjm-g67v",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-73800",
        "https://github.com/go-gitea/gitea/pull/38886",
        "https://github.com/go-gitea/gitea/pull/38897"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-829",
          "CWE-94"
        ],
        "cna_assigner": "Gitea",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73800.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-73800",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500069,
  "published_at": "2026-10-14T14:37:49.783+00:00"
}