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EUVD-2026-12416

🗓️ 16 Mar 2026 15:30:42Reported by EUVDType 
euvd
 euvd
🔗 euvd.enisa.europa.eu👁 17 Views

Mattermost versions fail to validate User-Agent tokens, enabling an authenticated attacker to trigger a request panic.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-25783
16 Mar 202612:04
–attackerkb
bdu_fstec
BDU FSTEC
Mattermost DoS
13 May 202600:00
–bdu_fstec
circl
Circl
CVE-2026-25783
16 Feb 202600:00
–circl
cnnvd
CNNVD
Mattermost security vulnerabilities
16 Mar 202600:00
–cnnvd
cve
CVE
CVE-2026-25783
16 Mar 202612:04
–cve
cvelist
Cvelist
CVE-2026-25783 Denial of service via malformed User-Agent header in getBrowserVersion
16 Mar 202612:04
–cvelist
github
Github Security Blog
Mattermost fails to properly validate User-Agent header tokens
16 Mar 202615:30
–github
mend
Mend
CVE-2026-25783
16 Mar 202612:04
–mend
nvd
NVD
CVE-2026-25783
16 Mar 202614:18
–nvd
osv_ghsa
osv_ghsa
GHSA-2V3W-6G35-5F9V Mattermost fails to properly validate User-Agent header tokens
16 Mar 202615:30
–osv_ghsa
Rows per page
[
  {
    "enisaIdVendor": [
      {
        "id": "471ffd44-73ca-3e70-9494-7c0c08f7eea5",
        "vendor": {
          "name": "Mattermost"
        }
      }
    ],
    "enisaIdProduct": [
      {
        "id": "224b1910-b3b0-3376-868b-a5c7a1c76343",
        "product": {
          "name": "Mattermost"
        },
        "product_version": "11.2.0 ≤11.2.2"
      },
      {
        "id": "471ffd44-73ca-3e70-9494-7c0c08f7eea5",
        "product": {
          "name": "Mattermost"
        },
        "product_version": ""
      },
      {
        "id": "9261a42f-993a-35b6-bbb5-b99312b76ff7",
        "product": {
          "name": "Mattermost"
        },
        "product_version": "10.11.0 ≤10.11.10"
      },
      {
        "id": "c116b6b0-5276-3390-ba6f-d057893693c9",
        "product": {
          "name": "Mattermost"
        },
        "product_version": "11.3.0 ≤11.3.0"
      }
    ]
  }
]

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16 Mar 2026 15:30Current
6.2Medium risk
Vulners AI Score6.2
CVSS 3.14.3
EPSS0.00296
SSVC
17