Nextcloud: Valid share tokens allow to access tempory upload files of share owner

{
  "id": "4ca3bbafd3f2fbbac5b726479883efc7007f5237a5a61146a8ffc36e2d063c1c",
  "url": "https://osv.dev/vulnerability/CVE-2026-45157",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Nextcloud: Valid share tokens allow to access tempory upload files of share owner",
    "summary": "Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, when a malicious user has access to a file share of a user, they could use this share token to also access the chunking upload directly and see temporary part files during on going uploads. It is recommended that the Nextcloud Server is upgraded to 32.0.9 or 33.0.3. It is recommended that the Nextcloud Enterprise Server is upgraded to 26.0.13.26, 27.1.11.25, 28.0.14.17, 29.0.16.16, 30.0.17.9, 31.0.14.5, 32.0.9 or 33.0.3",
    "evidence": "osv:CVE-2026-45157",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-45157",
      "aliases": [
        "BIT-nextcloud-2026-45157",
        "CVE-2026-45157",
        "GHSA-45pj-p7x7-4mhc"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nextcloud/server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "5ee29decb00508122f008abacea26fb3e122b13c"
                },
                {
                  "fixed": "4671436d69566600853aedaec61cb27966480075"
                },
                {
                  "introduced": "72c37934b777f496bf6b9bc12e5d702423a22d8a"
                },
                {
                  "fixed": "360808e82fd5af666d51e8ab143d54febe7d8d9e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "32.0.0"
                      },
                      {
                        "fixed": "32.0.9"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "33.0.0"
                      },
                      {
                        "fixed": "33.0.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v32.0.9rc2",
            "v33.0.3rc2",
            "v32.0.9rc1",
            "v33.0.3rc1",
            "v33.0.2",
            "v32.0.8",
            "v32.0.8rc1",
            "v33.0.2rc1",
            "v32.0.7",
            "v33.0.1",
            "v33.0.1rc2",
            "v32.0.7rc1",
            "v33.0.1rc1",
            "v33.0.0",
            "v32.0.6",
            "v32.0.6rc1",
            "v32.0.5",
            "v32.0.4",
            "v32.0.4rc1",
            "v32.0.3",
            "v32.0.3rc2",
            "v32.0.3rc1",
            "v32.0.2",
            "v32.0.2rc2",
            "v32.0.2rc1",
            "v32.0.1",
            "v32.0.1rc2",
            "v32.0.1rc1",
            "v32.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45157.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.693240987Z",
      "provider": "osv",
      "references": [
        "https://hackerone.com/reports/3483708",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45157.json",
        "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-45pj-p7x7-4mhc",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-45157",
        "https://github.com/nextcloud/server/pull/59780"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-284"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45157.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-45157",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492446,
  "published_at": "2026-06-01T16:39:12.214+00:00"
}