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EUVD-2026-12425

🗓️ 16 Mar 2026 15:30:46Reported by EUVDType 
euvd
 euvd
🔗 euvd.enisa.europa.eu👁 18 Views

Mattermost versions fail to validate upload_file permissions, enabling guest posts across teams.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-4265
16 Mar 202612:07
–attackerkb
bdu_fstec
BDU FSTEC
Mattermost Authentication Bypass File Upload
13 May 202600:00
–bdu_fstec
circl
Circl
CVE-2026-4265
17 Mar 202600:00
–circl
cnnvd
CNNVD
Mattermost 安全漏洞
16 Mar 202600:00
–cnnvd
cve
CVE
CVE-2026-4265
16 Mar 202612:07
–cve
cvelist
Cvelist
CVE-2026-4265 Guest user can upload files without permission across teams
16 Mar 202612:07
–cvelist
github
Github Security Blog
Mattermost fails to validate team-specific upload_file permissions
16 Mar 202615:30
–github
mend
Mend
CVE-2026-4265
16 Mar 202612:07
–mend
nvd
NVD
CVE-2026-4265
16 Mar 202614:20
–nvd
osv_ghsa
osv_ghsa
GHSA-XPVF-6QCC-9JQC Mattermost fails to validate team-specific upload_file permissions
16 Mar 202615:30
–osv_ghsa
Rows per page
[
  {
    "enisaIdVendor": [
      {
        "id": "d76912ee-e9c8-3ffd-bd16-6a2f7148a277",
        "vendor": {
          "name": "Mattermost"
        }
      }
    ],
    "enisaIdProduct": [
      {
        "id": "28c04f59-4317-3621-b13c-b725739b7435",
        "product": {
          "name": "Mattermost"
        },
        "product_version": "11.3.0 ≤11.3.0"
      },
      {
        "id": "39b37581-cb76-3887-ab09-9db9aa53a48b",
        "product": {
          "name": "Mattermost"
        },
        "product_version": "10.11.0 ≤10.11.10"
      },
      {
        "id": "3eb37895-3f03-3ac6-92c0-1976ebfa9b25",
        "product": {
          "name": "Mattermost"
        },
        "product_version": "11.2.0 ≤11.2.2"
      },
      {
        "id": "d76912ee-e9c8-3ffd-bd16-6a2f7148a277",
        "product": {
          "name": "Mattermost"
        },
        "product_version": ""
      }
    ]
  }
]

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16 Mar 2026 15:30Current
6.3Medium risk
Vulners AI Score6.3
CVSS 3.14.3
EPSS0.00379
SSVC
18