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Gitea TOTP single-use enforcement defect allows OTP replay

Type: advisorySources: OSV

Gitea versions from 1.5.0 before 1.26.3 have a TOTP single-use enforcement defect that allows a valid TOTP code to be accepted more than once across web two-factor authentication flows and the Basic Auth X-Gitea-OTP path.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-20779
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 10:21 UTC · Revision 1

Source evidence

Gitea TOTP single-use enforcement defect allows OTP replay

core-osv · Original source

Published 3 Jul 2026, 20:19 UTC

Gitea versions from 1.5.0 before 1.26.3 have a TOTP single-use enforcement defect that allows a valid TOTP code to be accepted more than once across web two-factor authentication flows and the Basic Auth X-Gitea-OTP path.

osv:CVE-2026-20779
Complete source record
{
  "id": "8150b17e46cab1900e5a83c1ebf6341f7c3e6af9ced5bef642b5ba24c1c526b1",
  "url": "https://osv.dev/vulnerability/CVE-2026-20779",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Gitea TOTP single-use enforcement defect allows OTP replay",
    "summary": "Gitea versions from 1.5.0 before 1.26.3 have a TOTP single-use enforcement defect that allows a valid TOTP code to be accepted more than once across web two-factor authentication flows and the Basic Auth X-Gitea-OTP path.",
    "evidence": "osv:CVE-2026-20779",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-20779",
      "aliases": [
        "CVE-2026-20779",
        "GHSA-gx3v-q759-g323",
        "GO-2026-6057"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/go-gitea/gitea",
              "type": "GIT",
              "events": [
                {
                  "introduced": "280ebcbf7c761a212fb091634384847a38f25cb0"
                },
                {
                  "fixed": "4aa0d704f2c7d30351016b740bfc45247fd77efa"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.5.0"
                      },
                      {
                        "fixed": "1.26.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "4aa0d704f2c7d30351016b740bfc45247fd77efa"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.26.3"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.5.0"
                      },
                      {
                        "fixed": "1.26.3"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.26.2",
            "v1.26.1",
            "v1.26.0",
            "v1.26.0-rc0",
            "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"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-20779.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:43.772101347Z",
      "provider": "osv",
      "references": [
        "https://blog.gitea.com/release-of-1.26.3-and-1.26.4/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/20xxx/CVE-2026-20779.json",
        "https://github.com/go-gitea/gitea/releases/tag/v1.26.3",
        "https://github.com/go-gitea/gitea/security/advisories/GHSA-gx3v-q759-g323",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-20779",
        "https://github.com/go-gitea/gitea/pull/38151"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-294"
        ],
        "cna_assigner": "Gitea",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/20xxx/CVE-2026-20779.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-20779",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 511613,
  "published_at": "2026-07-03T20:19:29.239+00:00"
}