Security advisory

{
  "id": "600754ccbb67006ba987a7b87861824f81adcc1d3801165fae28d182c5b66d3f",
  "url": "https://osv.dev/vulnerability/CVE-2021-22896",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-22896",
    "summary": "Nextcloud Mail before 1.9.5 suffers from improper access control due to a missing permission check allowing other authenticated users to create mail aliases for other users.",
    "evidence": "osv:CVE-2021-22896",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-22896",
      "aliases": [
        "BIT-nextcloud-2021-22896",
        "CVE-2021-22896",
        "GHSA-jmgp-77jq-fjp3"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nextcloud/mail",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "11434a58dd79fccb02de18cead5b37dfe0c6e871"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "11434a58dd79fccb02de18cead5b37dfe0c6e871"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.9.5"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.9.4",
            "v1.9.3",
            "v1.9.2",
            "v1.9.1",
            "v1.9.0",
            "v1.9.0-alpha3",
            "v1.9.0-alpha2",
            "v1.8.0",
            "1.6.2",
            "v1.7.0",
            "v1.6.0",
            "v1.5.0",
            "v1.5.0-rc2",
            "v1.5.0-rc1",
            "v1.5.0-beta3",
            "v1.5.0-beta2",
            "v1.5.0-beta1",
            "v1.5.0-alpha3",
            "v1.4.0-rc1",
            "v1.4.0-beta2",
            "v1.4.0-beta1",
            "nightly-20200513",
            "nightly-20200506",
            "nightly-20200427",
            "nightly-20200423",
            "v1.3.3",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.3.0-RC1",
            "v1.3.0-beta3",
            "v1.3.0-beta2",
            "v1.1.2",
            "v1.3.0-beta1",
            "v1.1.1",
            "v1.1.0",
            "v1.0.0",
            "nightly-20200115",
            "v0.21.1",
            "v0.21.0",
            "v0.20.3",
            "v0.20.2",
            "v0.20.1",
            "v0.20.0",
            "v0.19.1",
            "v0.19.0",
            "v0.18.1",
            "v0.18.0",
            "v0.18.0-RC1",
            "v0.17.0",
            "v0.16.0",
            "v0.15.5",
            "v0.15.4",
            "v0.15.3",
            "v0.15.2",
            "v0.15.1",
            "v0.15.0",
            "v0.14.0",
            "v0.13.0",
            "v0.11.0",
            "v0.12.0",
            "v0.12.0-RC3",
            "v0.12.0-RC2",
            "v0.12.0-beta5",
            "v0.12.0-beta4",
            "v0.12.0-beta2",
            "v0.12.0-beta1",
            "v0.12.0-alpha3",
            "v0.10.0",
            "v0.9.0",
            "v0.8.3",
            "v0.8.2",
            "untagged-bd8a3cab1eb0022ec683",
            "v0.8.1",
            "v0.8.0",
            "nightly-20180410",
            "v0.8.0-beta1",
            "v0.8.0-alpha1",
            "v0.7.10",
            "v0.7.9",
            "v0.7.8",
            "v0.7.7",
            "v0.7.6",
            "nightly-20171212",
            "v0.7.5",
            "nightly-20171127",
            "v0.7.4",
            "nightly-20170913",
            "v0.7.3",
            "v0.7.2",
            "nightly-20170906",
            "v0.7.1",
            "nightly-20170831",
            "nighly-20170831",
            "v0.7.0",
            "nightly-20170823",
            "nightly-20170612",
            "v0.6.2",
            "nightly-20170117",
            "nightly-20161218",
            "nightly-20161208",
            "nightly-20161202",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.4.4",
            "v0.4.3",
            "v0.4.2",
            "v0.4.1",
            "v0.4.0",
            "v0.3.0",
            "v0.2.0",
            "v0.1.3",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-22896.json"
          }
        }
      ],
      "modified": "2026-10-24T10:50:40.865633995Z",
      "provider": "osv",
      "references": [
        "https://github.com/nextcloud/mail/releases/tag/v1.9.5",
        "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jmgp-77jq-fjp3",
        "https://hackerone.com/reports/1129996",
        "https://github.com/nextcloud/mail/pull/4864"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "nextcloud:nextcloud",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "1.9.5"
                  },
                  {
                    "fixed": "1.9.5"
                  },
                  {
                    "fixed": "1.9.5"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "1.9.5"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-22896",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 442460,
  "published_at": "2021-06-11T16:15:10.887+00:00"
}