CVE-2026-45543 (GCVE-0-2026-45543)
Vulnerability from cvelistv5
Published
2026-06-01 17:00
Modified
2026-06-01 19:33
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-552 - Files or Directories Accessible to External Parties
Summary
Nextcloud is an open source content collaboration platform. From version 4.3.0 to before version 5.2.7, a removed collaborator retains unauthorized read access to uploaded respondent files for the affected form. The scope is limited to uploaded files for forms where that user previously had results access. This issue has been patched in version 5.2.7.
References
Impacted products
Vendor Product Version
nextcloud security-advisories Version: >= 4.3.0, < 5.2.7
 Create a notification for this product.
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        "metrics": [
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            "other": {
              "content": {
                "id": "CVE-2026-45543",
                "options": [
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2026-06-01T19:33:00.290011Z",
                "version": "2.0.3"
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        }
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      "metrics": [
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          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
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          "name": "https://github.com/nextcloud/forms/pull/3291",
          "tags": [
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          "tags": [
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      "source": {
        "advisory": "GHSA-q4fw-6jf8-5vhh",
        "discovery": "UNKNOWN"
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      "title": "Nextcloud: Deleting a Forms collaborator share leaves uploaded response files accessible through a lingering Files share"
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    "dateReserved": "2026-05-12T17:48:47.879Z",
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    "state": "PUBLISHED"
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  "dataVersion": "5.2"
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