CVE-2026-45266 (GCVE-0-2026-45266)

Vulnerability from cvelistv5 – Published: 2026-06-01 16:39 – Updated: 2026-06-01 17:40
VLAI
Title
Nextcloud: Unauthorized force-mute from missing permission check when using internal signaling
Summary
Nextcloud is an open source content collaboration platform. Prior to versions 21.1.10, 22.0.11, and 23.0.3, a low-privileged user can force other user's microphones to be muted in calls when no High-performance Backend is installed. This issue has been patched in versions 21.1.10, 22.0.11, and 23.0.3.
Severity
3.5 (Low)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-284 - Improper Access Control
Assigner
References
Impacted products
Vendor Product Version
nextcloud security-advisories Affected: < 21.1.10
Affected: < 22.0.11
Affected: < 23.0.3
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45266",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-01T17:35:39.122672Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-01T17:40:19.878Z",
          "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 21.1.10"
            },
            {
              "status": "affected",
              "version": "\u003c 22.0.11"
            },
            {
              "status": "affected",
              "version": "\u003c 23.0.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Nextcloud is an open source content collaboration platform. Prior to versions 21.1.10, 22.0.11, and 23.0.3, a low-privileged user can force other user\u0027s microphones to be muted in calls when no High-performance Backend is installed. This issue has been patched in versions 21.1.10, 22.0.11, and 23.0.3."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.5,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-284",
              "description": "CWE-284: Improper Access Control",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-01T16:39:56.879Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x75r-65hm-cw35",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x75r-65hm-cw35"
        },
        {
          "name": "https://github.com/nextcloud/spreed/pull/17577",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nextcloud/spreed/pull/17577"
        },
        {
          "name": "https://hackerone.com/reports/3636758",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://hackerone.com/reports/3636758"
        }
      ],
      "source": {
        "advisory": "GHSA-x75r-65hm-cw35",
        "discovery": "UNKNOWN"
      },
      "title": "Nextcloud: Unauthorized force-mute from missing permission check when using internal signaling"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-45266",
    "datePublished": "2026-06-01T16:39:56.879Z",
    "dateReserved": "2026-05-11T18:41:13.156Z",
    "dateUpdated": "2026-06-01T17:40:19.878Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-45266",
      "date": "2026-07-22",
      "epss": "0.00203",
      "percentile": "0.10417"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-45266\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-06-01T17:17:09.827\",\"lastModified\":\"2026-07-22T07:10:00.107\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Nextcloud is an open source content collaboration platform. Prior to versions 21.1.10, 22.0.11, and 23.0.3, a low-privileged user can force other user\u0027s microphones to be muted in calls when no High-performance Backend is installed. This issue has been patched in versions 21.1.10, 22.0.11, and 23.0.3.\"},{\"lang\":\"es\",\"value\":\"Nextcloud es una plataforma de colaboraci\u00f3n de contenido de c\u00f3digo abierto. Antes de las versiones 21.1.10, 22.0.11 y 23.0.3, un usuario con pocos privilegios puede forzar que los micr\u00f3fonos de otros usuarios se silencien en las llamadas cuando no hay un Backend de alto rendimiento instalado. Este problema ha sido parcheado en las versiones 21.1.10, 22.0.11 y 23.0.3.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"nextcloud\",\"product\":\"security-advisories\",\"versions\":[{\"version\":\"\u003c 21.1.10\",\"status\":\"affected\"},{\"version\":\"\u003c 22.0.11\",\"status\":\"affected\"},{\"version\":\"\u003c 23.0.3\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N\",\"baseScore\":3.5,\"baseSeverity\":\"LOW\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.1,\"impactScore\":1.4}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-06-01T17:35:39.122672Z\",\"id\":\"CVE-2026-45266\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-284\"}]}],\"references\":[{\"url\":\"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x75r-65hm-cw35\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/nextcloud/spreed/pull/17577\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://hackerone.com/reports/3636758\",\"source\":\"security-advisories@github.com\"}]}}",
    "redhat_vex": {
      "current_release_date": "2026-06-05T19:47:31+00:00",
      "cve": "CVE-2026-45266",
      "id": "CVE-2026-45266",
      "initial_release_date": "2026-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Nextcloud: Unauthorized force-mute from missing permission check when using internal signaling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45266.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-45266\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-01T17:35:39.122672Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-01T17:40:15.423Z\"}}], \"cna\": {\"title\": \"Nextcloud: Unauthorized force-mute from missing permission check when using internal signaling\", \"source\": {\"advisory\": \"GHSA-x75r-65hm-cw35\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 3.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"LOW\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"nextcloud\", \"product\": \"security-advisories\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 21.1.10\"}, {\"status\": \"affected\", \"version\": \"\u003c 22.0.11\"}, {\"status\": \"affected\", \"version\": \"\u003c 23.0.3\"}]}], \"references\": [{\"url\": \"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x75r-65hm-cw35\", \"name\": \"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x75r-65hm-cw35\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/nextcloud/spreed/pull/17577\", \"name\": \"https://github.com/nextcloud/spreed/pull/17577\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://hackerone.com/reports/3636758\", \"name\": \"https://hackerone.com/reports/3636758\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Nextcloud is an open source content collaboration platform. Prior to versions 21.1.10, 22.0.11, and 23.0.3, a low-privileged user can force other user\u0027s microphones to be muted in calls when no High-performance Backend is installed. This issue has been patched in versions 21.1.10, 22.0.11, and 23.0.3.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-284\", \"description\": \"CWE-284: Improper Access Control\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-06-01T16:39:56.879Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-45266\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-01T17:40:19.878Z\", \"dateReserved\": \"2026-05-11T18:41:13.156Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-06-01T16:39:56.879Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.