certfr_avis - certfr-2026-avi-0599

CERTFR-2026-AVI-0599

Vulnerability from certfr_avis

Une vulnérabilité a été découverte dans Microsoft Exchange Server. Elle permet à un attaquant de provoquer une injection de code indirecte à distance (XSS) et un contournement de la politique de sécurité.

Microsoft indique que la vulnérabilité CVE-2026-42897 est activement exploitée.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
Microsoft	N/A	Microsoft Exchange Server 2019 Cumulative Update 15
Microsoft	N/A	Microsoft Exchange Server 2016 Cumulative Update 23
Microsoft	N/A	Microsoft Exchange Server Subscription Edition RTM
Microsoft	N/A	Microsoft Exchange Server 2019 Cumulative Update 14

References

Title

Publication Time

Tags

Bulletin de sécurité Microsoft CVE-2026-42897

2026-05-14

vendor-advisory

Show details on source website

JSON

To clipboard

{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": "Microsoft Exchange Server 2019 Cumulative Update 15",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Microsoft Exchange Server 2016 Cumulative Update 23",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Microsoft Exchange Server Subscription Edition RTM",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Microsoft Exchange Server 2019 Cumulative Update 14",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": "",
  "content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
  "cves": [
    {
      "name": "CVE-2026-42897",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42897"
    }
  ],
  "initial_release_date": "2026-05-15T00:00:00",
  "last_revision_date": "2026-05-15T00:00:00",
  "links": [],
  "reference": "CERTFR-2026-AVI-0599",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2026-05-15T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "Injection de code indirecte \u00e0 distance (XSS)"
    },
    {
      "description": "Contournement de la politique de s\u00e9curit\u00e9"
    }
  ],
  "summary": "Une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 d\u00e9couverte dans Microsoft Exchange Server. Elle permet \u00e0 un attaquant de provoquer une injection de code indirecte \u00e0 distance (XSS) et un contournement de la politique de s\u00e9curit\u00e9.\n\nMicrosoft indique que la vuln\u00e9rabilit\u00e9 CVE-2026-42897 est activement exploit\u00e9e.",
  "title": "Vuln\u00e9rabilit\u00e9 dans Microsoft Exchange Server",
  "vendor_advisories": [
    {
      "published_at": "2026-05-14",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft CVE-2026-42897",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897"
    }
  ]
}

CVE-2026-42897 (GCVE-0-2026-42897)

Vulnerability from cvelistv5

Published

2026-05-14 17:00

Modified

2026-06-09 19:33

Severity ?

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Summary

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

References

URL

Tags

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897

vendor-advisory, patch

Impacted products

Vendor

Product

Version

Microsoft

Microsoft Exchange Server 2016 Cumulative Update 23

Version: 15.01.0.0 < 15.01.2507.069

Microsoft	Microsoft Exchange Server 2019 Cumulative Update 14	Version: 15.02.0.0 < 15.02.1544.041
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 15	Version: 15.02.0.0 < 15.02.1748.046
Microsoft	Microsoft Exchange Server Subscription Edition RTM	Version: 15.02.0.0 < 15.02.2562.043

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42897",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-14T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
          {
            "other": {
              "content": {
                "dateAdded": "2026-05-15",
                "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897"
              },
              "type": "kev"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-16T03:55:55.096Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "government-resource"
            ],
            "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-05-15T00:00:00.000Z",
            "value": "CVE-2026-42897 added to CISA KEV"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft Exchange Server 2016 Cumulative Update 23",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "15.01.2507.069",
              "status": "affected",
              "version": "15.01.0.0",
              "versionType": "custom"
            }
          ]
        },
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          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft Exchange Server 2019 Cumulative Update 14",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "15.02.1544.041",
              "status": "affected",
              "version": "15.02.0.0",
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            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft Exchange Server 2019 Cumulative Update 15",
          "vendor": "Microsoft",
          "versions": [
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        },
        {
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          ],
          "product": "Microsoft Exchange Server Subscription Edition RTM",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "15.02.2562.043",
              "status": "affected",
              "version": "15.02.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:microsoft:exchange_server_2016:*:cumulative_update_23:*:*:*:*:*:*",
                  "versionEndExcluding": "15.01.2507.069",
                  "versionStartIncluding": "15.01.0.0",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "15.02.1544.041",
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                  "versionEndExcluding": "15.02.1748.046",
                  "versionStartIncluding": "15.02.0.0",
                  "vulnerable": true
                },
                {
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "datePublic": "2026-05-14T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "value": "Improper neutralization of input during web page generation (\u0027cross-site scripting\u0027) in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
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          ]
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      ],
      "problemTypes": [
        {
          "descriptions": [
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              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-09T19:33:14.221Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "name": "Microsoft Exchange Server Spoofing Vulnerability",
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897"
        }
      ],
      "title": "Microsoft Exchange Server Spoofing Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
    "assignerShortName": "microsoft",
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    "datePublished": "2026-05-14T17:00:36.515Z",
    "dateReserved": "2026-04-30T22:35:54.967Z",
    "dateUpdated": "2026-06-09T19:33:14.221Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

CERTFR-2026-AVI-0599

Vulnerability from certfr_avis

Solutions

CVE-2026-42897 (GCVE-0-2026-42897)

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature