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EUVD-2026-31430

🗓️ 22 May 2026 10:25:17Reported by EUVDType 
euvd
 euvd
🔗 euvd.enisa.europa.eu👁 42 Views

Mattermost versions 11.6 to 10.11 fail to validate input via the application interface, enabling authenticated attackers to crash the plugin.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-4646
22 May 202610:25
–attackerkb
bdu_fstec
BDU FSTEC
Mattermost API Request Handler DoS
1 Jun 202600:00
–bdu_fstec
circl
Circl
CVE-2026-4646
22 May 202613:05
–circl
cnnvd
CNNVD
Mattermost security vulnerabilities
22 May 202600:00
–cnnvd
cve
CVE
CVE-2026-4646
22 May 202610:25
–cve
cvelist
Cvelist
CVE-2026-4646 Insufficient input validation in GitHub plugin API causes denial of service
22 May 202610:25
–cvelist
github
Github Security Blog
Mattermost doesn't validate user-supplied input in API request handlers
26 May 202613:30
–github
mend
Mend
CVE-2026-4646
22 May 202610:25
–mend
nvd
NVD
CVE-2026-4646
22 May 202611:16
–nvd
osv_ghsa
osv_ghsa
GHSA-RMVV-8V8W-RF7X Mattermost doesn't validate user-supplied input in API request handlers
26 May 202613:30
–osv_ghsa
Rows per page
[
  {
    "enisaIdVendor": [
      {
        "id": "a784a949-275d-3fea-9fb8-33b253040b22",
        "vendor": {
          "name": "Mattermost"
        }
      }
    ],
    "enisaIdProduct": [
      {
        "id": "1d66cc6b-9148-31bb-83cf-4bed5d55b545",
        "product": {
          "name": "Mattermost"
        },
        "product_version": "11.5.0 ≤11.5.3"
      },
      {
        "id": "205c324d-20b4-354d-babf-433fc94caa0e",
        "product": {
          "name": "Mattermost"
        },
        "product_version": "11.4.0 ≤11.4.4"
      },
      {
        "id": "3f9de4e8-05d1-3bb1-9b70-9c7905a25530",
        "product": {
          "name": "Mattermost"
        },
        "product_version": "10.11.0 ≤10.11.14"
      },
      {
        "id": "478a5698-16d7-3c70-a979-9d6414970af0",
        "product": {
          "name": "Mattermost"
        },
        "product_version": "11.6.0 ≤11.6.0"
      }
    ]
  }
]

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22 May 2026 12:13Current
6.3Medium risk
Vulners AI Score6.3
CVSS 3.14.3
EPSS0.0025
SSVC
42