CVE-2026-11993 (GCVE-0-2026-11993)

Vulnerability from cvelistv5 – Published: 2026-09-14 10:29 – Updated: 2026-09-14 19:36
VLAI
Title
Fix authenticated members disabling file content indexing server-wide via extraction pool exhaustion
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 properly enforce the limit of concurrent files being processed and handled failed files, which allows a user with permission to upload files to spawn more goroutines than intended and block the indexing of other files via uploading heavy files constantly to the server.. Mattermost Advisory ID: MMSA-2026-00696
Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 19:36 UTC
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
Mattermost CNA under the mitre root
CNA scorecard B 80/100 over 123 records in the last 180 days details
References
URL Tags
https://mattermost.com/security-updates vendor-advisory
Impacted products
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 Create a notification for this product.
Credits
JG Heithcock
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-11993",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-14T19:36:23.391913Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-14T19:36:34.391Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "JG Heithcock"
        }
      ],
      "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 properly enforce the limit of concurrent files being processed and handled failed files, which allows a user with permission to upload files to spawn more goroutines than intended and block the indexing of other files via uploading heavy files constantly to the server.. Mattermost Advisory ID: MMSA-2026-00696"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T10:29:19.934Z",
        "orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
        "shortName": "Mattermost"
      },
      "references": [
        {
          "name": "MMSA-2026-00696",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://mattermost.com/security-updates"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Update Mattermost to versions 11.10.0, 11.9.1, 11.8.5, 11.7.8, 10.11.23 or higher."
        }
      ],
      "source": {
        "advisory": "MMSA-2026-00696",
        "defect": [
          "https://mattermost.atlassian.net/browse/MM-69217"
        ],
        "discovery": "{\"self\"=\u003e\"https://mattermost.atlassian.net/rest/api/2/customFieldOption/10557\", \"value\"=\u003e\"Internal\", \"id\"=\u003e\"10557\"}"
      },
      "title": "Fix authenticated members disabling file content indexing server-wide via extraction pool exhaustion",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
    "assignerShortName": "Mattermost",
    "cveId": "CVE-2026-11993",
    "datePublished": "2026-09-14T10:29:19.934Z",
    "dateReserved": "2026-06-11T14:54:55.079Z",
    "dateUpdated": "2026-09-14T19:36:34.391Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-11993",
      "date": "2026-10-25",
      "epss": "0.00367",
      "percentile": "0.30298"
    },
    "nvd": {
      "cve": {
        "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"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "0125A38B-0B1B-47BA-B304-7038A717569D",
                    "versionEndExcluding": "10.11.23",
                    "versionStartIncluding": "10.11.0",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "D2DA84D0-1DE9-4846-88A0-377A6AE7FF7F",
                    "versionEndExcluding": "11.7.8",
                    "versionStartIncluding": "11.7.0",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "28B7B007-C6AE-43A8-8E34-67A52789DC27",
                    "versionEndExcluding": "11.8.5",
                    "versionStartIncluding": "11.8.0",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "AAA4200F-4BD8-4E69-A405-81E98F6208D5",
                    "versionEndExcluding": "11.9.1",
                    "versionStartIncluding": "11.9.0",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "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 properly enforce the limit of concurrent files being processed and handled failed files, which allows a user with permission to upload files to spawn more goroutines than intended and block the indexing of other files via uploading heavy files constantly to the server.. Mattermost Advisory ID: MMSA-2026-00696"
          }
        ],
        "id": "CVE-2026-11993",
        "lastModified": "2026-10-07T16:23:58.010",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 4.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
                "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-2026-11993",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-14T19:36:23.391913Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-09-14T11:17:02.800",
        "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-770"
              }
            ],
            "source": "responsibledisclosure@mattermost.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-11993",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-09-14T19:36:23.391913Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-09-14T19:36:29.817Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "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"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "JG Heithcock"
            }
          ],
          "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 properly enforce the limit of concurrent files being processed and handled failed files, which allows a user with permission to upload files to spawn more goroutines than intended and block the indexing of other files via uploading heavy files constantly to the server.. Mattermost Advisory ID: MMSA-2026-00696"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 4.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-770",
                  "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-14T10:29:19.934Z",
            "orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
            "shortName": "Mattermost"
          },
          "references": [
            {
              "name": "MMSA-2026-00696",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://mattermost.com/security-updates"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "value": "Update Mattermost to versions 11.10.0, 11.9.1, 11.8.5, 11.7.8, 10.11.23 or higher."
            }
          ],
          "source": {
            "advisory": "MMSA-2026-00696",
            "defect": [
              "https://mattermost.atlassian.net/browse/MM-69217"
            ],
            "discovery": "{\"self\"=\u003e\"https://mattermost.atlassian.net/rest/api/2/customFieldOption/10557\", \"value\"=\u003e\"Internal\", \"id\"=\u003e\"10557\"}"
          },
          "title": "Fix authenticated members disabling file content indexing server-wide via extraction pool exhaustion",
          "x_generator": {
            "engine": "cvelib 1.8.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
        "assignerShortName": "Mattermost",
        "cveId": "CVE-2026-11993",
        "datePublished": "2026-09-14T10:29:19.934Z",
        "dateReserved": "2026-06-11T14:54:55.079Z",
        "dateUpdated": "2026-09-14T19:36:34.391Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.