Vulnerability-Lookup

CVE-2026-2461 (GCVE-0-2026-2461)

Vulnerability from cvelistv5 – Published: 2026-03-16 11:16 – Updated: 2026-03-16 13:49

Title

Missing authorization check allows unauthorized modification of other users' comments on a board

Summary

Mattermost Plugins versions <=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members. Mattermost Advisory ID: MMSA-2025-00559

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 · CISA-ADP (v2.0.3)

Decision recorded 2026-03-16 13:42 UTC

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

Mattermost mitre root

References

1 reference

URL	Tags
https://mattermost.com/security-updates	vendor-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
Mattermost	Mattermost	Affected: 0 , ≤ 11.0.3 (semver) Affected: 0 , ≤ 11.2.2 (semver) Affected: 0 , ≤ 10.10.11 (semver) Unaffected: 11.4.0 Unaffected: 11.3.1 Unaffected: 11.2.3 Unaffected: 10.11.11	guessed

Credits

daynight

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-2461",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-16T13:42:41.162405Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-16T13:49:57.924Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Mattermost",
          "vendor": "Mattermost",
          "versions": [
            {
              "lessThanOrEqual": "11.0.3",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "11.2.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "10.10.11",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "11.4.0"
            },
            {
              "status": "unaffected",
              "version": "11.3.1"
            },
            {
              "status": "unaffected",
              "version": "11.2.3"
            },
            {
              "status": "unaffected",
              "version": "10.11.11"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "daynight"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mattermost Plugins versions \u003c=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members.  Mattermost Advisory ID: MMSA-2025-00559"
        }
      ],
      "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"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-639",
              "description": "CWE-639: Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-16T11:16:32.720Z",
        "orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
        "shortName": "Mattermost"
      },
      "references": [
        {
          "name": "MMSA-2025-00559",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://mattermost.com/security-updates"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Update Mattermost Plugins to versions 11.4.0, 11.3.1, 11.2.3, 10.11.11 or higher."
        }
      ],
      "source": {
        "advisory": "MMSA-2025-00559",
        "defect": [
          "https://mattermost.atlassian.net/browse/MM-66751"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "Missing authorization check allows unauthorized modification of other users\u0027 comments on a board",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
    "assignerShortName": "Mattermost",
    "cveId": "CVE-2026-2461",
    "datePublished": "2026-03-16T11:16:32.720Z",
    "dateReserved": "2026-02-13T11:09:37.505Z",
    "dateUpdated": "2026-03-16T13:49:57.924Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-2461",
      "date": "2026-09-15",
      "epss": "0.00162",
      "percentile": "0.05781"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-2461\",\"sourceIdentifier\":\"responsibledisclosure@mattermost.com\",\"published\":\"2026-03-16T14:19:29.753\",\"lastModified\":\"2026-06-17T10:31:05.690\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Mattermost Plugins versions \u003c=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members.  Mattermost Advisory ID: MMSA-2025-00559\"},{\"lang\":\"es\",\"value\":\"Las versiones de los plugins de Mattermost \u0026lt;=11.3 11.0.3 11.2.2 10.10.11.0 no implementan comprobaciones de autorizaci\u00f3n en las modificaciones de bloques de comentarios, lo que permite a un atacante autorizado con permiso de editor modificar comentarios creados por otros miembros del tablero. ID de aviso de Mattermost: MMSA-2025-00559\"}],\"affected\":[{\"source\":\"responsibledisclosure@mattermost.com\",\"affectedData\":[{\"vendor\":\"Mattermost\",\"product\":\"Mattermost\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThanOrEqual\":\"11.0.3\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThanOrEqual\":\"11.2.2\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThanOrEqual\":\"10.10.11\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"11.4.0\",\"status\":\"unaffected\"},{\"version\":\"11.3.1\",\"status\":\"unaffected\"},{\"version\":\"11.2.3\",\"status\":\"unaffected\"},{\"version\":\"10.11.11\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"responsibledisclosure@mattermost.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N\",\"baseScore\":4.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":1.4}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-03-16T13:42:41.162405Z\",\"id\":\"CVE-2026-2461\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"responsibledisclosure@mattermost.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-639\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"10.11.11\",\"matchCriteriaId\":\"BCB7AD99-5C39-426F-842F-71A2EA2A15BF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"11.0.0\",\"versionEndIncluding\":\"11.0.3\",\"matchCriteriaId\":\"D19D4EFF-0820-4296-A13B-4706A6C0F643\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"11.1.0\",\"versionEndExcluding\":\"11.2.3\",\"matchCriteriaId\":\"3889F6BD-40C6-4AE8-802B-73ACFD119A04\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"11.3.0\",\"versionEndExcluding\":\"11.3.1\",\"matchCriteriaId\":\"945A6E29-209F-4992-8692-BEF63DCB6B98\"}]}]}],\"references\":[{\"url\":\"https://mattermost.com/security-updates\",\"source\":\"responsibledisclosure@mattermost.com\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "redhat_vex": {
      "current_release_date": "2026-03-27T08:00:58+00:00",
      "cve": "CVE-2026-2461",
      "id": "CVE-2026-2461",
      "initial_release_date": "2026-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Missing authorization check allows unauthorized modification of other users\u0027 comments on a board",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2461.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-03-31T08:38:45Z",
      "cve": "CVE-2026-2461",
      "id": "CVE-2026-2461",
      "initial_release_date": "2026-03-28T18:28:49Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-2461",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-2461.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-2461\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-16T13:42:41.162405Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-16T13:44:17.926Z\"}}], \"cna\": {\"title\": \"Missing authorization check allows unauthorized modification of other users\u0027 comments on a board\", \"source\": {\"defect\": [\"https://mattermost.atlassian.net/browse/MM-66751\"], \"advisory\": \"MMSA-2025-00559\", \"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"daynight\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 4.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Mattermost\", \"product\": \"Mattermost\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"11.0.3\"}, {\"status\": \"affected\", \"version\": \"0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"11.2.2\"}, {\"status\": \"affected\", \"version\": \"0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"10.10.11\"}, {\"status\": \"unaffected\", \"version\": \"11.4.0\"}, {\"status\": \"unaffected\", \"version\": \"11.3.1\"}, {\"status\": \"unaffected\", \"version\": \"11.2.3\"}, {\"status\": \"unaffected\", \"version\": \"10.11.11\"}], \"defaultStatus\": \"unaffected\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Update Mattermost Plugins to versions 11.4.0, 11.3.1, 11.2.3, 10.11.11 or higher.\"}], \"references\": [{\"url\": \"https://mattermost.com/security-updates\", \"name\": \"MMSA-2025-00559\", \"tags\": [\"vendor-advisory\"]}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Mattermost Plugins versions \u003c=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members.  Mattermost Advisory ID: MMSA-2025-00559\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-639\", \"description\": \"CWE-639: Authorization Bypass Through User-Controlled Key\"}]}], \"providerMetadata\": {\"orgId\": \"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee\", \"shortName\": \"Mattermost\", \"dateUpdated\": \"2026-03-16T11:16:32.720Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-2461\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-16T13:49:57.924Z\", \"dateReserved\": \"2026-02-13T11:09:37.505Z\", \"assignerOrgId\": \"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee\", \"datePublished\": \"2026-03-16T11:16:32.720Z\", \"assignerShortName\": \"Mattermost\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-2461

Vulnerability from fkie_nvd - Published: 2026-03-16 14:19 - Updated: 2026-06-17 10:31

Severity

4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Summary

References

	URL	Tags
	responsibledisclosure@mattermost.com	https://mattermost.com/security-updates	Vendor Advisory

Impacted products

Vendor	Product	Version
mattermost	mattermost_server	*
mattermost	mattermost_server	*
mattermost	mattermost_server	*
mattermost	mattermost_server	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Mattermost",
          "vendor": "Mattermost",
          "versions": [
            {
              "lessThanOrEqual": "11.0.3",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "11.2.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "10.10.11",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "11.4.0"
            },
            {
              "status": "unaffected",
              "version": "11.3.1"
            },
            {
              "status": "unaffected",
              "version": "11.2.3"
            },
            {
              "status": "unaffected",
              "version": "10.11.11"
            }
          ]
        }
      ],
      "source": "responsibledisclosure@mattermost.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "BCB7AD99-5C39-426F-842F-71A2EA2A15BF",
              "versionEndExcluding": "10.11.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D19D4EFF-0820-4296-A13B-4706A6C0F643",
              "versionEndIncluding": "11.0.3",
              "versionStartIncluding": "11.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "3889F6BD-40C6-4AE8-802B-73ACFD119A04",
              "versionEndExcluding": "11.2.3",
              "versionStartIncluding": "11.1.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "945A6E29-209F-4992-8692-BEF63DCB6B98",
              "versionEndExcluding": "11.3.1",
              "versionStartIncluding": "11.3.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mattermost Plugins versions \u003c=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members.  Mattermost Advisory ID: MMSA-2025-00559"
    },
    {
      "lang": "es",
      "value": "Las versiones de los plugins de Mattermost \u0026lt;=11.3 11.0.3 11.2.2 10.10.11.0 no implementan comprobaciones de autorizaci\u00f3n en las modificaciones de bloques de comentarios, lo que permite a un atacante autorizado con permiso de editor modificar comentarios creados por otros miembros del tablero. ID de aviso de Mattermost: MMSA-2025-00559"
    }
  ],
  "id": "CVE-2026-2461",
  "lastModified": "2026-06-17T10:31:05.690",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "responsibledisclosure@mattermost.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-2461",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-16T13:42:41.162405Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-16T14:19:29.753",
  "references": [
    {
      "source": "responsibledisclosure@mattermost.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://mattermost.com/security-updates"
    }
  ],
  "sourceIdentifier": "responsibledisclosure@mattermost.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        }
      ],
      "source": "responsibledisclosure@mattermost.com",
      "type": "Secondary"
    }
  ]
}

GHSA-HF8W-X9H5-5GF9

Vulnerability from github – Published: 2026-03-16 15:30 – Updated: 2026-03-19 17:49

Summary

Mattermost Boards Plugin fails to implement authorisation checks on comment block modifications

Details

Severity

4.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/mattermost/mattermost-plugin-boards"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260108044135-57c5be5b6ef5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-2461"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-19T17:49:20Z",
    "nvd_published_at": "2026-03-16T14:19:29Z",
    "severity": "MODERATE"
  },
  "details": "Mattermost Plugins versions \u003c=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members.  Mattermost Advisory ID: MMSA-2025-00559",
  "id": "GHSA-hf8w-x9h5-5gf9",
  "modified": "2026-03-19T17:49:20Z",
  "published": "2026-03-16T15:30:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2461"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mattermost/mattermost-plugin-boards/commit/57c5be5b6ef59d02dd72e35094d1fae8ba6e9619"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mattermost/mattermost-plugin-boards"
    },
    {
      "type": "WEB",
      "url": "https://mattermost.com/security-updates"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Mattermost Boards Plugin fails to implement authorisation checks on comment block modifications"
}

WID-SEC-W-2026-0422

Vulnerability from csaf_certbund - Published: 2026-02-15 23:00 - Updated: 2026-03-19 23:00

Summary

Mattermost: Mehrere Schwachstellen

Severity

Mittel

Scope

19 vulnerabilities in this advisory, including CVE-2026-2461.

CVE-2026-2461

Known affected: 8 products

Open the full advisory

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-2461 (GCVE-0-2026-2461)

FKIE_CVE-2026-2461

GHSA-HF8W-X9H5-5GF9

WID-SEC-W-2026-0422

Tags

Sightings

Nomenclature

Related by attack behaviour