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CVE-2026-3495

Estado: AnalizadaMedia (4.8)—

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to escape some variables that could contain malicious content during error page composition which allows an attacker with access to edit some site configuration to execute some malicious code via injecting some JS as part of those values.. Mattermost Advisory ID: MMSA-2026-00622

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Mattermost — Mattermost Server

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-3495",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-3495",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-18T14:33:19.230906Z"
        }
      }
    ],
    "cvssMetricV31": [
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        "cvssData": {
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          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "privilegesRequired": "HIGH",
          "confidentialityImpact": "LOW"
        },
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        "source": "nvd@nist.gov",
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          "userInteraction": "REQUIRED",
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          "confidentialityImpact": "LOW"
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          "product": "Mattermost",
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              "versionType": "semver",
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            },
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              "version": "11.6.0"
            },
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              "version": "11.5.2"
            },
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            }
          ],
          "defaultStatus": "unaffected"
        }
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  ],
  "published": "2026-05-18T08:16:13.900",
  "references": [
    {
      "url": "https://mattermost.com/security-updates",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "responsibledisclosure@mattermost.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Secondary",
      "source": "responsibledisclosure@mattermost.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to escape some variables that could contain malicious content during error page composition which allows an attacker with access to edit some site configuration to execute some malicious code via injecting some JS as part of those values.. Mattermost Advisory ID: MMSA-2026-00622"
    }
  ],
  "lastModified": "2026-06-17T10:43:40.463",
  "configurations": [
    {
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              "versionEndExcluding": "10.11.14",
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            },
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          "operator": "OR"
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  "sourceIdentifier": "responsibledisclosure@mattermost.com"
}