SAML certificate deletion allows path traversal to delete arbitrary files outside the config directory

Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to verify file deletion path which allows an admin with SAML system-console write permissions to delete arbitrary files outside the config directory from the server via the remove file endpoint.. Mattermost Advisory ID: MMSA-2026-00666

Problem type

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected products

Mattermost

Mattermost

<= 11.8.0 - AFFECTED

<= 11.7.3 - AFFECTED

<= 11.6.5 - AFFECTED

<= 10.11.20 - AFFECTED

11.9.0 - UNAFFECTED

11.8.1 - UNAFFECTED

11.7.4 - UNAFFECTED

11.6.6 - UNAFFECTED

10.11.21 - UNAFFECTED

References

MMSA-2026-00666

https://mattermost.com/security-updates

vendor-advisory

GitHub Security Advisories

GHSA-rxgw-2f9c-c2hh

Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20...

https://github.com/advisories/GHSA-rxgw-2f9c-c2hh

nvd.nist.gov

https://nvd.nist.gov/vuln/detail/CVE-2026-7521

mattermost.com

https://mattermost.com/security-updates

github.com

https://github.com/advisories/GHSA-rxgw-2f9c-c2hh

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-7521

Click to expand

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-7521",
    "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
    "assignerShortName": "Mattermost",
    "dateUpdated": "2026-07-28T13:58:31.551Z",
    "dateReserved": "2026-04-30T16:51:23.295Z",
    "datePublished": "2026-07-28T13:58:31.551Z",
    "state": "PUBLISHED"
  },
  "containers": {
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        "orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
        "shortName": "Mattermost",
        "dateUpdated": "2026-07-28T13:58:31.551Z"
      },
      "title": "SAML certificate deletion allows path traversal to delete arbitrary files outside the config directory",
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        {
          "lang": "en",
          "value": "Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to verify file deletion path which allows an admin with SAML system-console write permissions to delete arbitrary files outside the config directory from the server via the remove file endpoint.. Mattermost Advisory ID: MMSA-2026-00666"
        }
      ],
      "affected": [
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          "defaultStatus": "unaffected",
          "versions": [
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            },
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              "version": "11.7.0",
              "status": "affected",
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            },
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              "version": "11.6.0",
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              "lessThanOrEqual": "10.11.20"
            },
            {
              "version": "11.9.0",
              "status": "unaffected"
            },
            {
              "version": "11.8.1",
              "status": "unaffected"
            },
            {
              "version": "11.7.4",
              "status": "unaffected"
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            {
              "version": "11.6.6",
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              "version": "10.11.21",
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              "lang": "en",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')",
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          "name": "MMSA-2026-00666",
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      "metrics": [
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              "value": "GENERAL"
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            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "HIGH",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM"
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      "solutions": [
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          "value": "Update Mattermost to versions 11.9.0, 11.8.1, 11.7.4, 11.6.6, 10.11.21 or higher."
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