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HTML injection via channel autocomplete

Type: advisorySources: OSV

Mattermost fails to use innerText / textContent when setting the channel name in the webapp during autocomplete, allowing an attacker to inject HTML to a victim's page by create a channel name that is valid HTML. No XSS is possible though.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2023-35075
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 01:45 UTC · Revision 1

Source evidence

HTML injection via channel autocomplete

core-osv · Original source

Published 27 Nov 2023, 09:09 UTC

Mattermost fails to use innerText / textContent when setting the channel name in the webapp during autocomplete, allowing an attacker to inject HTML to a victim's page by create a channel name that is valid HTML. No XSS is possible though.

osv:CVE-2023-35075
Complete source record
{
  "id": "edcb5a7ea5a13a512c287393788da774ba544fb4a0324753e9182c17dd40e113",
  "url": "https://osv.dev/vulnerability/CVE-2023-35075",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HTML injection via channel autocomplete",
    "summary": "Mattermost fails to use innerText / textContent when setting the channel name in the webapp during autocomplete, allowing an attacker to inject HTML to a victim's page by create a channel name that is valid HTML. No XSS is possible though.",
    "evidence": "osv:CVE-2023-35075",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2023-35075",
      "aliases": [
        "CVE-2023-35075",
        "GHSA-jcgv-3pfq-j4hr"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mattermost/mattermost",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "b69ff7d1038609a4a29a7db104679d21da10ad09"
                },
                {
                  "introduced": "90f502dc2dc80ee25cfb7d7bc3e743b53564a5a7"
                },
                {
                  "last_affected": "4fe1024a51f22f239c19c33838dbdcf7589b7b94"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "7.8.12"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0"
                      },
                      {
                        "last_affected": "8.1.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v8.1.3-rc2",
            "v8.1.3",
            "v7.8.12-rc2",
            "v7.8.12",
            "v7.8.12-rc1",
            "v8.1.3-rc1",
            "v8.1.2-rc2",
            "v8.1.2",
            "v7.8.11-rc1",
            "v7.8.11",
            "v8.1.2-rc1",
            "v7.8.10-rc5",
            "v7.8.10",
            "v8.1.1-rc2",
            "v8.1.1",
            "@mattermost/types@8.1.1",
            "@mattermost/client@8.1.1",
            "v7.8.10-rc4",
            "v8.1.1-rc1",
            "v7.8.10-rc3",
            "v8.1.0-rc2",
            "v8.1.0",
            "cloud-2023-07-26-1",
            "v7.8.9",
            "v7.8.8",
            "server/public/v0.0.5",
            "v7.8.7",
            "v7.8.6",
            "v7.8.5",
            "v7.8.4",
            "v7.8.3",
            "v7.8.2",
            "v7.8.1",
            "v7.8.0",
            "cloud-2023-01-26-1",
            "cloud-2022-11-24-1",
            "cloud-2022-11-11-1",
            "cloud-2022-10-06-1",
            "cloud-2022-09-08-1",
            "cloud-2022-08-10-1",
            "cloud-2022-07-20-1",
            "v5.2.0-rc2",
            "v5.2.0-rc1",
            "v5.1.0-rc1",
            "v5.0.0-rc1",
            "v4.10.0-rc1",
            "v4.9.0-rc1",
            "v4.8.0-rc1",
            "v4.7.0-rc1",
            "v4.6.0-rc2",
            "v4.6.0-rc1",
            "v4.5.0-rc1",
            "v4.4.0-rc1",
            "v4.3.0-rc1",
            "v4.2.0-rc1",
            "v0.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-35075.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.424392478Z",
      "provider": "osv",
      "references": [
        "https://mattermost.com/security-updates",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/35xxx/CVE-2023-35075.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-35075"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-74"
        ],
        "cna_assigner": "Mattermost",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "8.1.3"
                  },
                  {
                    "last_affected": "7.8.12"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/35xxx/CVE-2023-35075.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-35075",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509187,
  "published_at": "2023-11-27T09:09:19.659+00:00"
}