Vulnerability-Lookup

CERTFR-2026-AVI-0052

Vulnerability from certfr_avis - Published: 2026-01-16 - Updated: 2026-02-16

De multiples vulnérabilités ont été découvertes dans Mattermost Server. Elles permettent à un attaquant de provoquer un contournement de la politique de sécurité 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 10.11.x antérieures à 10.11.10
Mattermost	Mattermost Server	Mattermost Server versions 11.1.x antérieures à 11.1.3
Mattermost	Mattermost Server	Mattermost Server versions 11.2.x antérieures à 11.2.2

References

Title

Publication Time

Tags

Bulletin de sécurité Mattermost MMSA-2025-00548	2026-01-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2025-00549	2026-01-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2025-00563	2026-01-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2025-00561	2026-01-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2025-00550	2026-01-15	vendor-advisory
Bulletin de sécurité Mattermost MMSA-2025-00560	2026-01-15	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 10.11.x ant\u00e9rieures \u00e0 10.11.10",
      "product": {
        "name": "Mattermost Server",
        "vendor": {
          "name": "Mattermost",
          "scada": false
        }
      }
    },
    {
      "description": "Mattermost Server versions 11.1.x ant\u00e9rieures \u00e0 11.1.3",
      "product": {
        "name": "Mattermost Server",
        "vendor": {
          "name": "Mattermost",
          "scada": false
        }
      }
    },
    {
      "description": "Mattermost Server versions 11.2.x ant\u00e9rieures \u00e0 11.2.2",
      "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-2026-20796",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-20796"
    },
    {
      "name": "CVE-2026-22892",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-22892"
    }
  ],
  "initial_release_date": "2026-01-16T00:00:00",
  "last_revision_date": "2026-02-16T00:00:00",
  "links": [],
  "reference": "CERTFR-2026-AVI-0052",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2026-01-16T00:00:00.000000"
    },
    {
      "description": "Ajout du bulletin de s\u00e9curit\u00e9 MMSA-2025-00548.",
      "revision_date": "2026-01-16T00:00:00.000000"
    },
    {
      "description": "Ajout r\u00e9f\u00e9rences CVE",
      "revision_date": "2026-02-16T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
    },
    {
      "description": "Contournement de la politique de s\u00e9curit\u00e9"
    }
  ],
  "summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Mattermost Server. Elles permettent \u00e0 un attaquant de provoquer un contournement de la politique de s\u00e9curit\u00e9 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": "2026-01-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2025-00548",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-01-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2025-00549",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-01-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2025-00563",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-01-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2025-00561",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-01-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2025-00550",
      "url": "https://mattermost.com/security-updates/"
    },
    {
      "published_at": "2026-01-15",
      "title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2025-00560",
      "url": "https://mattermost.com/security-updates/"
    }
  ]
}

CVE-2026-22892 (GCVE-0-2026-22892)

Vulnerability from cvelistv5 – Published: 2026-02-13 10:29 – Updated: 2026-02-13 17:03

Title

Insufficient Authorization in Mattermost Jira Plugin Allows Unauthorized Access to Post Attachments

Summary

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to validate user permissions when creating Jira issues from Mattermost posts, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to via the /create-issue API endpoint by providing the post ID of an inaccessible post.. Mattermost Advisory ID: MMSA-2025-00550

Severity ?

4.3 (Medium)


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

CWE

CWE-863 - Incorrect Authorization

Assigner

Mattermost

References

URL

Tags

https://mattermost.com/security-updates

vendor-advisory

Impacted products

	Vendor	Product	Version
	Mattermost	Mattermost	Affected: 11.1.0 , ≤ 11.1.2 (semver) Affected: 10.11.0 , ≤ 10.11.9 (semver) Affected: 11.2.0 , ≤ 11.2.1 (semver) Unaffected: 11.3.0 Unaffected: 11.1.3 Unaffected: 10.11.10 Unaffected: 11.2.2

Credits

Juho Forsén

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-22892",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-13T17:03:09.966734Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-13T17:03:30.894Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Mattermost",
          "vendor": "Mattermost",
          "versions": [
            {
              "lessThanOrEqual": "11.1.2",
              "status": "affected",
              "version": "11.1.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "10.11.9",
              "status": "affected",
              "version": "10.11.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "11.2.1",
              "status": "affected",
              "version": "11.2.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "11.3.0"
            },
            {
              "status": "unaffected",
              "version": "11.1.3"
            },
            {
              "status": "unaffected",
              "version": "10.11.10"
            },
            {
              "status": "unaffected",
              "version": "11.2.2"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Juho Fors\u00e9n"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mattermost versions 11.1.x \u003c= 11.1.2, 10.11.x \u003c= 10.11.9, 11.2.x \u003c= 11.2.1 fail to validate user permissions when creating Jira issues from Mattermost posts, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to via the /create-issue API endpoint by providing the post ID of an inaccessible post.. Mattermost Advisory ID: MMSA-2025-00550"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-13T10:29:00.943Z",
        "orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
        "shortName": "Mattermost"
      },
      "references": [
        {
          "name": "MMSA-2025-00550",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://mattermost.com/security-updates"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Update Mattermost to versions 11.3.0, 11.1.3, 10.11.10, 11.2.2 or higher."
        }
      ],
      "source": {
        "advisory": "MMSA-2025-00550",
        "defect": [
          "https://mattermost.atlassian.net/browse/MM-66325"
        ],
        "discovery": "{\"self\"=\u003e\"https://mattermost.atlassian.net/rest/api/2/customFieldOption/10557\", \"value\"=\u003e\"Internal\", \"id\"=\u003e\"10557\"}"
      },
      "title": "Insufficient Authorization in Mattermost Jira Plugin Allows Unauthorized Access to Post Attachments"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
    "assignerShortName": "Mattermost",
    "cveId": "CVE-2026-22892",
    "datePublished": "2026-02-13T10:29:00.943Z",
    "dateReserved": "2026-01-15T11:34:00.188Z",
    "dateUpdated": "2026-02-13T17:03:30.894Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-20796 (GCVE-0-2026-20796)

Vulnerability from cvelistv5 – Published: 2026-02-13 10:30 – Updated: 2026-02-13 17:02

Title

Time-of-check time-of-use vulnerability in common teams API

Summary

Mattermost versions 10.11.x <= 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /common_teams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549

Severity ?

3.1 (Low)


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

CWE

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

Mattermost

References

URL

Tags

https://mattermost.com/security-updates

vendor-advisory

Impacted products

	Vendor	Product	Version
	Mattermost	Mattermost	Affected: 10.11.0 , ≤ 10.11.9 (semver) Unaffected: 11.3.0 Unaffected: 10.11.10

Credits

Juho Forsén

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-20796",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-13T17:01:37.056493Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-13T17:02:25.985Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Mattermost",
          "vendor": "Mattermost",
          "versions": [
            {
              "lessThanOrEqual": "10.11.9",
              "status": "affected",
              "version": "10.11.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "11.3.0"
            },
            {
              "status": "unaffected",
              "version": "10.11.10"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Juho Fors\u00e9n"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mattermost versions 10.11.x \u003c= 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /common_teams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.1,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-367",
              "description": "CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-13T10:30:03.445Z",
        "orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
        "shortName": "Mattermost"
      },
      "references": [
        {
          "name": "MMSA-2025-00549",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://mattermost.com/security-updates"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Update Mattermost to versions 11.3.0, 10.11.10 or higher."
        }
      ],
      "source": {
        "advisory": "MMSA-2025-00549",
        "defect": [
          "https://mattermost.atlassian.net/browse/MM-66423"
        ],
        "discovery": "{\"self\"=\u003e\"https://mattermost.atlassian.net/rest/api/2/customFieldOption/10557\", \"value\"=\u003e\"Internal\", \"id\"=\u003e\"10557\"}"
      },
      "title": "Time-of-check time-of-use vulnerability in common teams API"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
    "assignerShortName": "Mattermost",
    "cveId": "CVE-2026-20796",
    "datePublished": "2026-02-13T10:30:03.445Z",
    "dateReserved": "2026-01-15T11:34:00.225Z",
    "dateUpdated": "2026-02-13T17:02:25.985Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Tags

Taxonomy of the tags.

All sightings related to this event Export sightings related to this event

Sightings

Author	Source	Type	Date

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.

Action not permitted

CERTFR-2026-AVI-0052

Solutions

CVE-2026-22892 (GCVE-0-2026-22892)

CVE-2026-20796 (GCVE-0-2026-20796)

Tags

Sightings

Nomenclature