Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2026-07-12 23:47

Modified

2026-07-13 00:08

Summary

Nextcloud Server users can modify tags on files that do not belong to them

Details

Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1.

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "nextcloud",
        "purl": "pkg:bitnami/nextcloud"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "31.0.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-66547"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:*:*:*:*"
    ],
    "severity": "Medium"
  },
  "details": "Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1.",
  "id": "BIT-nextcloud-2025-66547",
  "modified": "2026-07-13T00:08:34.851Z",
  "published": "2026-07-12T23:47:57.830Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nextcloud/server/issues/51247"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nextcloud/server/pull/51288"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3040887"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66547"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Nextcloud Server users can modify tags on files that do not belong to them"
}

CVE-2025-66547 (GCVE-0-2025-66547)

Vulnerability from cvelistv5 – Published: 2025-12-05 16:32 – Updated: 2025-12-05 18:20

Title

Nextcloud Server users can modify tags on files that do not belong to them

Summary

Severity

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

GitHub_M

References

5 references

URL	Tags
https://github.com/nextcloud/security-advisories/…	x_refsource_CONFIRM
https://github.com/nextcloud/server/issues/51247	x_refsource_MISC
https://github.com/nextcloud/server/pull/51288	x_refsource_MISC
https://github.com/nextcloud/server/commit/b44f15…	x_refsource_MISC
https://hackerone.com/reports/3040887	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
nextcloud	security-advisories	Affected: < 31.0.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-66547",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-05T18:20:11.023676Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-12-05T18:20:43.503Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "security-advisories",
          "vendor": "nextcloud",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 31.0.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-639",
              "description": "CWE-639: Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-05T16:32:17.359Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2"
        },
        {
          "name": "https://github.com/nextcloud/server/issues/51247",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nextcloud/server/issues/51247"
        },
        {
          "name": "https://github.com/nextcloud/server/pull/51288",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nextcloud/server/pull/51288"
        },
        {
          "name": "https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9"
        },
        {
          "name": "https://hackerone.com/reports/3040887",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://hackerone.com/reports/3040887"
        }
      ],
      "source": {
        "advisory": "GHSA-hq6c-r898-fgf2",
        "discovery": "UNKNOWN"
      },
      "title": "Nextcloud Server users can modify tags on files that do not belong to them"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-66547",
    "datePublished": "2025-12-05T16:32:17.359Z",
    "dateReserved": "2025-12-04T15:52:26.550Z",
    "dateUpdated": "2025-12-05T18:20:43.503Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

Vulnerability from bitnami_vulndb

CVE-2025-66547 (GCVE-0-2025-66547)

Tags

Sightings

Nomenclature