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CVE-2026-45501

Status: ModifiedMedium (6.1)—

Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to perform spoofing over a network.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Microsoft — Exchange ServerMicrosoft — Exchange Server Subscription Edition

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-45501",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-45501",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-09T19:52:25.296776Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "secure@microsoft.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "Microsoft",
          "product": "Microsoft Exchange Server 2016 Cumulative Update 23",
          "versions": [
            {
              "status": "affected",
              "version": "15.01.0.0",
              "lessThan": "15.01.2507.071",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "x64-based Systems"
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Exchange Server 2019 Cumulative Update 14",
          "versions": [
            {
              "status": "affected",
              "version": "15.02.0.0",
              "lessThan": "15.02.1544.043",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "x64-based Systems"
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Exchange Server 2019 Cumulative Update 15",
          "versions": [
            {
              "status": "affected",
              "version": "15.02.0.0",
              "lessThan": "15.02.1748.048",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "x64-based Systems"
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Exchange Server Subscription Edition RTM",
          "versions": [
            {
              "status": "affected",
              "version": "15.02.0.0",
              "lessThan": "15.02.2562.045",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "x64-based Systems"
          ]
        }
      ]
    }
  ],
  "published": "2026-06-09T17:17:25.880",
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45501",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "secure@microsoft.com"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secure@microsoft.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to perform spoofing over a network."
    },
    {
      "lang": "es",
      "value": "Neutralización incorrecta de la entrada durante la generación de páginas web ('cross-site scripting') en Microsoft Exchange Server permite a un atacante no autorizado realizar suplantación de identidad a través de una red."
    }
  ],
  "lastModified": "2026-07-28T23:16:58.700",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FF76AEDA-E574-40ED-B64F-8FDEF8CAC802"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_14:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8C98993B-82A5-48CC-947F-896CEA0CDB7F"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_15:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7166BCE0-1D55-46B2-96B9-250AB4BB6291"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server_subscription_edition:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A4DB559B-001D-487D-8EA2-36F8AD7BAF51",
              "versionEndExcluding": "15.02.2562.043"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secure@microsoft.com"
}