Vulnerability-Lookup

WID-SEC-W-2023-0824

Vulnerability from csaf_certbund - Published: 2023-04-02 22:00 - Updated: 2026-02-09 23:00

Summary

Nextcloud: Mehrere Schwachstellen

Severity

Hoch

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: Nextcloud ist eine "on-premise" Plattform für Dateifreigabe und Zusammenarbeit.

Angriff: Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Nextcloud ausnutzen, um beliebigen Programmcode auszuführen oder Informationen offenzulegen.

Betroffene Betriebssysteme: - Linux - UNIX - Windows

CVE-2023-26482

Affected products

Known affected 2 products

Product	Identifier	Version	Remediation
Nextcloud Nextcloud <25.0.4 Server Nextcloud / Nextcloud		<25.0.4 Server
Nextcloud Nextcloud <24.0.10 Server Nextcloud / Nextcloud		<24.0.10 Server

CVE-2023-28845

Affected products

Known affected 2 products

Product	Identifier	Version	Remediation
Nextcloud Nextcloud <15.0.4 Talk Nextcloud / Nextcloud		<15.0.4 Talk
Nextcloud Nextcloud <14.0.9 Talk Nextcloud / Nextcloud		<14.0.9 Talk

References

5 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://github.com/nextcloud/security-advisories/…	external
https://github.com/nextcloud/security-advisories/…	external
https://github.com/ISabbiI/PoC---CVE-2023-26482-R…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Nextcloud ist eine \"on-premise\" Plattform f\u00fcr Dateifreigabe und Zusammenarbeit.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Nextcloud ausnutzen, um beliebigen Programmcode auszuf\u00fchren oder Informationen offenzulegen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- UNIX\n- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2023-0824 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2023/wid-sec-w-2023-0824.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2023-0824 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2023-0824"
      },
      {
        "category": "external",
        "summary": "Nextcloud Security Advisory  vom 2023-04-02",
        "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3m6r-479j-4chf"
      },
      {
        "category": "external",
        "summary": "Nextcloud Security Advisory  vom 2023-04-02",
        "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj"
      },
      {
        "category": "external",
        "summary": "PoC CVE-2023-26482 vom 2026-02-09",
        "url": "https://github.com/ISabbiI/PoC---CVE-2023-26482-RCE-LAB-Nextcloud"
      }
    ],
    "source_lang": "en-US",
    "title": "Nextcloud: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2026-02-09T23:00:00.000+00:00",
      "generator": {
        "date": "2026-02-10T11:12:44.006+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.5.0"
        }
      },
      "id": "WID-SEC-W-2023-0824",
      "initial_release_date": "2023-04-02T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2023-04-02T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-02-09T23:00:00.000+00:00",
          "number": "2",
          "summary": "PoC f\u00fcr CVE-2023-26482 aufgenommen"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c14.0.9 Talk",
                "product": {
                  "name": "Nextcloud Nextcloud \u003c14.0.9 Talk",
                  "product_id": "T027048"
                }
              },
              {
                "category": "product_version",
                "name": "14.0.9 Talk",
                "product": {
                  "name": "Nextcloud Nextcloud 14.0.9 Talk",
                  "product_id": "T027048-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:nextcloud:nextcloud:14.0.9_talk"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c15.0.4 Talk",
                "product": {
                  "name": "Nextcloud Nextcloud \u003c15.0.4 Talk",
                  "product_id": "T027049"
                }
              },
              {
                "category": "product_version",
                "name": "15.0.4 Talk",
                "product": {
                  "name": "Nextcloud Nextcloud 15.0.4 Talk",
                  "product_id": "T027049-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:nextcloud:nextcloud:15.0.4_talk"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c24.0.10 Server",
                "product": {
                  "name": "Nextcloud Nextcloud \u003c24.0.10 Server",
                  "product_id": "T027050"
                }
              },
              {
                "category": "product_version",
                "name": "24.0.10 Server",
                "product": {
                  "name": "Nextcloud Nextcloud 24.0.10 Server",
                  "product_id": "T027050-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:nextcloud:nextcloud:24.0.10_server"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c25.0.4 Server",
                "product": {
                  "name": "Nextcloud Nextcloud \u003c25.0.4 Server",
                  "product_id": "T027052"
                }
              },
              {
                "category": "product_version",
                "name": "25.0.4 Server",
                "product": {
                  "name": "Nextcloud Nextcloud 25.0.4 Server",
                  "product_id": "T027052-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:nextcloud:nextcloud:25.0.4_server"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Nextcloud"
          }
        ],
        "category": "vendor",
        "name": "Nextcloud"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-26482",
      "product_status": {
        "known_affected": [
          "T027052",
          "T027050"
        ]
      },
      "release_date": "2023-04-02T22:00:00.000+00:00",
      "title": "CVE-2023-26482"
    },
    {
      "cve": "CVE-2023-28845",
      "product_status": {
        "known_affected": [
          "T027049",
          "T027048"
        ]
      },
      "release_date": "2023-04-02T22:00:00.000+00:00",
      "title": "CVE-2023-28845"
    }
  ]
}

CVE-2023-26482 (GCVE-0-2023-26482)

Vulnerability from cvelistv5 – Published: 2023-03-30 18:27 – Updated: 2025-02-11 18:54

Title

Scope of workflow operations is not validated in nextcloud server

Summary

Nextcloud server is an open source home cloud implementation. In affected versions a missing scope validation allowed users to create workflows which are designed to be only available for administrators. Some workflows are designed to be RCE by invoking defined scripts, in order to generate PDFs, invoking webhooks or running scripts on the server. Due to this combination depending on the available apps the issue can result in a RCE at the end. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. Users unable to upgrade should disable app `workflow_scripts` and `workflow_pdf_converter` as a mitigation.

Severity

9.1 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/nextcloud/security-advisories/…	x_refsource_CONFIRM
https://github.com/nextcloud/server/commit/5a06b5…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
nextcloud	security-advisories	Affected: < 24.0.10 Affected: >= 25.0.0, < 25.0.4

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T11:53:53.652Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj",
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj"
          },
          {
            "name": "https://github.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-26482",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-11T18:54:30.467700Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-02-11T18:54:35.797Z",
          "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 24.0.10"
            },
            {
              "status": "affected",
              "version": "\u003e= 25.0.0, \u003c 25.0.4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Nextcloud server is an open source home cloud implementation. In affected versions a missing scope validation allowed users to create workflows which are designed to be only available for administrators. Some workflows are designed to be RCE by invoking defined scripts, in order to generate PDFs, invoking webhooks or running scripts on the server. Due to this combination depending on the available apps the issue can result in a RCE at the end. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. Users unable to upgrade should disable app `workflow_scripts` and `workflow_pdf_converter` as a mitigation."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-78",
              "description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-03-30T18:27:17.333Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      "references": [
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          "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj",
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          ],
          "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj"
        },
        {
          "name": "https://github.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60"
        }
      ],
      "source": {
        "advisory": "GHSA-h3c9-cmh8-7qpj",
        "discovery": "UNKNOWN"
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      "title": "Scope of workflow operations is not validated in nextcloud server"
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  "cveMetadata": {
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    "datePublished": "2023-03-30T18:27:17.333Z",
    "dateReserved": "2023-02-23T23:22:58.574Z",
    "dateUpdated": "2025-02-11T18:54:35.797Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

CVE-2023-28845 (GCVE-0-2023-28845)

Vulnerability from cvelistv5 – Published: 2023-03-31 22:13 – Updated: 2025-02-11 17:13

Title

Chat room membership disclosed via autocompletion in Nextcloud talk

Summary

Nextcloud talk is a video & audio conferencing app for Nextcloud. In affected versions the talk app does not properly filter access to a conversations member list. As a result an attacker could use this vulnerability to gain information about the members of a Talk conversation, even if they themselves are not members. It is recommended that the Nextcloud Talk is upgraded to 14.0.9 or 15.0.4. There are no known workarounds for this vulnerability.

Severity

3.5 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-284 - Improper Access Control

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/nextcloud/security-advisories/…	x_refsource_CONFIRM
https://github.com/nextcloud/spreed/pull/8651	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
nextcloud	security-advisories	Affected: >= 15.0.0, < 15.0.4 Affected: >= 14.0.0, < 14.0.9

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T13:51:38.693Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3m6r-479j-4chf",
            "tags": [
              "x_refsource_CONFIRM",
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            ],
            "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3m6r-479j-4chf"
          },
          {
            "name": "https://github.com/nextcloud/spreed/pull/8651",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/nextcloud/spreed/pull/8651"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-28845",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-11T17:13:20.850979Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-02-11T17:13:26.478Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "security-advisories",
          "vendor": "nextcloud",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 15.0.0, \u003c 15.0.4"
            },
            {
              "status": "affected",
              "version": "\u003e= 14.0.0, \u003c 14.0.9"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Nextcloud talk is a video \u0026 audio conferencing app for Nextcloud. In affected versions the talk app does not properly filter access to a conversations member list. As a result an attacker could use this vulnerability to gain information about the members of a Talk conversation, even if they themselves are not members. It is recommended that the Nextcloud Talk is upgraded to 14.0.9 or 15.0.4. There are no known workarounds for this vulnerability."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.5,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
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          "descriptions": [
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              "description": "CWE-284: Improper Access Control",
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        },
        {
          "name": "https://github.com/nextcloud/spreed/pull/8651",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nextcloud/spreed/pull/8651"
        }
      ],
      "source": {
        "advisory": "GHSA-3m6r-479j-4chf",
        "discovery": "UNKNOWN"
      },
      "title": "Chat room membership disclosed via autocompletion in Nextcloud talk"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2023-28845",
    "datePublished": "2023-03-31T22:13:44.046Z",
    "dateReserved": "2023-03-24T16:25:34.466Z",
    "dateUpdated": "2025-02-11T17:13:26.478Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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

WID-SEC-W-2023-0824

CVE-2023-26482 (GCVE-0-2023-26482)

CVE-2023-28845 (GCVE-0-2023-28845)

Tags

Sightings

Nomenclature