Vulnerability-Lookup

CVE-2026-91181 (GCVE-0-2026-91181)

Vulnerability from cvelistv5 – Published: 2026-09-14 21:21 – Updated: 2026-09-16 03:56

Title

Data Retention Teams Endpoint Leaks Private Team Invite ID

Summary

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 Fail to sanitize Team objects returned by the data retention teams endpoint which allows an authenticated user holding only the read-only Data Retention Policy permission to obtain a private team's secret invite_id and email, and use it to join the team without authorization, via GET /api/v4/data_retention/policies/{policy_id}/teams.. Mattermost Advisory ID: MMSA-2026-00702

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 00:00 UTC

CWE

CWE-863 - Incorrect Authorization

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: 11.9.0 , ≤ 11.9.0 (semver) Affected: 11.8.0 , ≤ 11.8.4 (semver) Affected: 11.7.0 , ≤ 11.7.7 (semver) Affected: 10.11.0 , ≤ 10.11.22 (semver) Unaffected: 11.10.0 Unaffected: 11.9.1 Unaffected: 11.8.5 Unaffected: 11.7.8 Unaffected: 10.11.23	guessed

Credits

0x7oda7123

Show details on NVD website

JSON

To clipboard

{
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      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-91181",
                "options": [
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                    "Exploitation": "none"
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                    "Automatable": "no"
                  },
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                    "Technical Impact": "total"
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-15T00:00:00+00:00",
                "version": "2.0.3"
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "11.8.4",
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              "status": "unaffected",
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              "status": "unaffected",
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            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
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        }
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        "defect": [
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      "title": "Data Retention Teams Endpoint Leaks Private Team Invite ID",
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    "datePublished": "2026-09-14T21:21:47.436Z",
    "dateReserved": "2026-09-14T21:20:45.375Z",
    "dateUpdated": "2026-09-16T03:56:15.095Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-91181",
      "date": "2026-09-16",
      "epss": "0.00227",
      "percentile": "0.13526"
    },
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    "vulnrichment": {
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}

CERTFR-2026-AVI-1190

Vulnerability from certfr_avis - Published: 2026-09-16 - Updated: 2026-09-16

De multiples vulnérabilités ont été découvertes dans Mattermost Server. Elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données et un problème de sécurité non spécifié par l'éditeur.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
Mattermost	Mattermost Server	Mattermost Server versions 11.9.x antérieures à 11.9.2
Mattermost	Mattermost Server	Mattermost Server versions 11.7.x antérieures à 11.7.11
Mattermost	Mattermost Server	Mattermost Server versions 11.10.x antérieures à 11.10.2
Mattermost	Mattermost Server	Mattermost Server versions antérieures à 10.11.23
Mattermost	Mattermost Server	Mattermost Server versions 11.8.x antérieures à 11.8.6

References

Title

Publication Time

Tags

Bulletin de sécurité Mattermost MMSA-2026-00773	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00761	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00763	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00747	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00726	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00752	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00757	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00756	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00711	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00727	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00764	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00765	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00754	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00758	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00748	2026-09-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00702	2026-09-14	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2026-00766	2026-09-15	vendor-advisory

Show details on source website

JSON

To clipboard

{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": "Mattermost Server versions 11.9.x ant\u00e9rieures \u00e0 11.9.2",
      "product": {
        "name": "Mattermost Server",
        "vendor": {
          "name": "Mattermost",
          "scada": false
        }
      }
    },
    {
      "description": "Mattermost Server versions 11.7.x ant\u00e9rieures \u00e0 11.7.11",
      "product": {
        "name": "Mattermost Server",
        "vendor": {
          "name": "Mattermost",
          "scada": false
        }
      }
    },
    {
      "description": "Mattermost Server versions 11.10.x ant\u00e9rieures \u00e0 11.10.2",
      "product": {
        "name": "Mattermost Server",
        "vendor": {
          "name": "Mattermost",
          "scada": false
        }
      }
    },
    {
      "description": "Mattermost Server versions ant\u00e9rieures \u00e0 10.11.23",
      "product": {
        "name": "Mattermost Server",
        "vendor": {
          "name": "Mattermost",
          "scada": false
        }
      }
    },
    {
      "description": "Mattermost Server versions 11.8.x ant\u00e9rieures \u00e0 11.8.6",
      "product": {
        "name": "Mattermost Server",
        "vendor": {
          "name": "Mattermost",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": "",
  "content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
  "cves": [
    {
      "name": "CVE-2026-91181",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-91181"
    }
  ],
  "initial_release_date": "2026-09-16T00:00:00",
  "last_revision_date": "2026-09-16T00:00:00",
  "links": [],
  "reference": "CERTFR-2026-AVI-1190",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2026-09-16T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
    },
    {
      "description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
    }
  ],
  "summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Mattermost Server. Elles permettent \u00e0 un attaquant de provoquer une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es et un probl\u00e8me de s\u00e9curit\u00e9 non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur.",
  "title": "Multiples vuln\u00e9rabilit\u00e9s dans Mattermost Server",
  "vendor_advisories": [
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00773",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00761",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00763",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00747",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00726",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00752",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00757",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00756",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00711",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00727",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00764",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00765",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00754",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00758",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00748",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-14",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00702",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-09-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00766",
      "url": "https://mattermost.com/security-updates/"
    }
  ]
}

FKIE_CVE-2026-91181

Vulnerability from fkie_nvd - Published: 2026-09-14 22:16 - Updated: 2026-09-16 19:30

Severity

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

Summary

References

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

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Mattermost",
          "vendor": "Mattermost",
          "versions": [
            {
              "lessThanOrEqual": "11.9.0",
              "status": "affected",
              "version": "11.9.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "11.8.4",
              "status": "affected",
              "version": "11.8.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "11.7.7",
              "status": "affected",
              "version": "11.7.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "10.11.22",
              "status": "affected",
              "version": "10.11.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "11.10.0"
            },
            {
              "status": "unaffected",
              "version": "11.9.1"
            },
            {
              "status": "unaffected",
              "version": "11.8.5"
            },
            {
              "status": "unaffected",
              "version": "11.7.8"
            },
            {
              "status": "unaffected",
              "version": "10.11.23"
            }
          ]
        }
      ],
      "source": "responsibledisclosure@mattermost.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mattermost versions 11.9.x \u003c= 11.9.0, 11.8.x \u003c= 11.8.4, 11.7.x \u003c= 11.7.7, 10.11.x \u003c= 10.11.22 Fail to sanitize Team objects returned by the data retention teams endpoint which allows an authenticated user holding only the read-only Data Retention Policy permission to obtain a private team\u0027s secret invite_id and email, and use it to join the team without authorization, via GET /api/v4/data_retention/policies/{policy_id}/teams.. Mattermost Advisory ID: MMSA-2026-00702"
    }
  ],
  "id": "CVE-2026-91181",
  "lastModified": "2026-09-16T19:30:49.967",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.2,
        "impactScore": 5.2,
        "source": "responsibledisclosure@mattermost.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-91181",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-15T00:00:00+00:00",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-14T22:16:59.643",
  "references": [
    {
      "source": "responsibledisclosure@mattermost.com",
      "url": "https://mattermost.com/security-updates"
    }
  ],
  "sourceIdentifier": "responsibledisclosure@mattermost.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "responsibledisclosure@mattermost.com",
      "type": "Secondary"
    }
  ]
}

GHSA-W86C-VMWH-PPPX

Vulnerability from github – Published: 2026-09-15 00:31 – Updated: 2026-09-15 00:31

Details

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-91181"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-14T22:16:59Z",
    "severity": "MODERATE"
  },
  "details": "Mattermost versions 11.9.x \u003c= 11.9.0, 11.8.x \u003c= 11.8.4, 11.7.x \u003c= 11.7.7, 10.11.x \u003c= 10.11.22 Fail to sanitize Team objects returned by the data retention teams endpoint which allows an authenticated user holding only the read-only Data Retention Policy permission to obtain a private team\u0027s secret invite_id and email, and use it to join the team without authorization, via GET /api/v4/data_retention/policies/{policy_id}/teams.. Mattermost Advisory ID: MMSA-2026-00702",
  "id": "GHSA-w86c-vmwh-pppx",
  "modified": "2026-09-15T00:31:13Z",
  "published": "2026-09-15T00:31:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91181"
    },
    {
      "type": "WEB",
      "url": "https://mattermost.com/security-updates"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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-2026-91181 (GCVE-0-2026-91181)

CERTFR-2026-AVI-1190

Solutions

FKIE_CVE-2026-91181

GHSA-W86C-VMWH-PPPX

Tags

Sightings

Nomenclature

Related by attack behaviour