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CVE-2023-28645

Status: ModifiedMedium (6.5)—

Nextcloud richdocuments is a Nextcloud app integrating the office suit Collabora Online. In affected versions the secure view feature of the rich documents app can be bypassed by using unprotected internal API endpoint of the rich documents app. It is recommended that the Nextcloud Office app (richdocuments) is upgraded to 8.0.0-beta.1, 7.0.2 or 6.3.2. Users unable to upgrade may mitigate the issue by taking steps to restrict the ability to download documents. This includes ensuring that the `WOPI configuration` is configured to only serve documents between Nextcloud and Collabora. It is highly recommended to define the list of Collabora server IPs as the allow list within the Office admin settings of Nextcloud.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Nextcloud — Richdocuments

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2023-28645",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2023-28645",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-02-11T17:18:33.975878Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.7,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.1
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
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      }
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  "affected": [
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      "source": "security-advisories@github.com",
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          "vendor": "nextcloud",
          "product": "security-advisories",
          "versions": [
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              "status": "affected",
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            },
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              "version": "< 6.3.2"
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  ],
  "published": "2023-03-31T23:15:07.397",
  "references": [
    {
      "url": "https://docs.nextcloud.com/server/latest/admin_manual/office/configuration.html#wopi-settings",
      "tags": [
        "Product"
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      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/nextcloud/richdocuments/pull/2604",
      "tags": [
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        "Vendor Advisory"
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      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-95j6-p5cj-5hh5",
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        "Vendor Advisory"
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      "source": "security-advisories@github.com"
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    {
      "url": "https://docs.nextcloud.com/server/latest/admin_manual/office/configuration.html#wopi-settings",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Nextcloud richdocuments is a Nextcloud app integrating the office suit Collabora Online. In affected versions the secure view feature of the rich documents app can be bypassed by using unprotected internal API endpoint of the rich documents app. It is recommended that the Nextcloud Office app (richdocuments) is upgraded to 8.0.0-beta.1, 7.0.2 or 6.3.2. Users unable to upgrade may mitigate the issue by taking steps to restrict the ability to download documents. This includes ensuring that the `WOPI configuration` is configured to only serve documents between Nextcloud and Collabora. It is highly recommended to define the list of Collabora server IPs as the allow list within the Office admin settings of Nextcloud."
    }
  ],
  "lastModified": "2026-06-17T05:48:27.550",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:nextcloud:richdocuments:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EA0BC53B-B9D9-467A-A58D-D2B41CEF0327",
              "versionEndExcluding": "6.3.2",
              "versionStartIncluding": "6.0.0"
            },
            {
              "criteria": "cpe:2.3:a:nextcloud:richdocuments:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7B7DAD1E-149D-4664-8B3A-492DA170CB69",
              "versionEndExcluding": "7.0.2",
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            }
          ],
          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "security-advisories@github.com"
}