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

Vulnerability from cvelistv5 – Published: 2026-05-14 17:00 – Updated: 2026-06-19 16:12
VLAI CISA KEVIntel
Title
Microsoft Exchange Server Spoofing Vulnerability
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.
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
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
Date Public
2026-05-14 14:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: aa500692-161b-45c6-8d92-a0c2a2b2944c

Vulnerability ID: CVE-2026-42897

Status: Confirmed

Status Updated: 2026-05-15 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-05-15
Asserted: 2026-05-15
Scope
Notes: KEV entry: Microsoft Exchange Server Cross-Site Scripting Vulnerability | Affected: Microsoft / Microsoft | Description: Microsoft Exchange Server contains a cross-site scripting vulnerability during web page generation in Outlook Web Access and when certain interaction conditions are met, arbitrary JavaScript can be executed in the browser context. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-05-29 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-42897 ; https://learn.microsoft.com/en-us/exchange/plan-and-deploy/post-installation-tasks/security-best-practices/exchange-emergency-mitigation-service ; https://nvd.nist.gov/vuln/detail/CVE-2026-42897
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-79
Feed CISA Known Exploited Vulnerabilities Catalog
Product Microsoft
Due Date 2026-05-29
Date Added 2026-05-15
Vendorproject Microsoft
Vulnerabilityname Microsoft Exchange Server Cross-Site Scripting Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-05-15 18:00 UTC | Updated: 2026-05-15 18:00 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0ea415e7-5f42-41a9-b307-13732d7df755

Vulnerability ID: CVE-2026-42897

Status: Confirmed

Status Updated: 2026-06-01 13:29 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: Microsoft Exchange Server Spoofing Vulnerability | Affected: Microsoft / Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server 2019 Cumulative Update 15, Microsoft Exchange Server Subscription Edition RTM | CVSS: 8.1 (HIGH) | EPSS: 0.02509 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Microsoft Exchange Server Spoofing Vulnerability
Vendor Microsoft
Product Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server 2019 Cumulative Update 15, Microsoft Exchange Server Subscription Edition RTM
Added Date 2026-06-01T13:29:03.497Z
Cvss Score 8.1
Epss Score 0.02509
Cvss Severity HIGH
Epss Percentile 0.82694
Used In Malware unknown
Ahead Of Cisa Kev 
{
  "count": 1,
  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-06-23 14:03 UTC
Show details on NVD website
To clipboard 

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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-42897\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-15T17:12:49.560340Z\"}}}, {\"other\": {\"type\": \"kev\", \"content\": {\"dateAdded\": \"2026-05-15\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897\"}}}], \"references\": [{\"url\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897\", \"tags\": [\"government-resource\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-15T09:56:59.338Z\"}, \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-05-15T00:00:00.000Z\", \"value\": \"CVE-2026-42897 added to CISA KEV\"}]}], \"cna\": {\"title\": \"Microsoft Exchange Server Spoofing Vulnerability\", \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"version\": \"3.1\", \"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\"}, \"scenarios\": [{\"lang\": \"en-US\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange Server 2016 Cumulative Update 23\", \"versions\": [{\"status\": \"affected\", \"version\": \"15.01.0.0\", \"lessThan\": \"15.01.2507.069\", \"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\": \"15.02.1544.041\", \"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\": \"15.02.1748.046\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange Server Subscription Edition RTM\", \"versions\": [{\"status\": \"affected\", \"version\": \"15.02.0.0\", \"lessThan\": \"15.02.2562.043\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}], \"datePublic\": \"2026-05-14T14:00:00.000Z\", \"references\": [{\"url\": \"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897\", \"name\": \"Microsoft Exchange Server Spoofing Vulnerability\", \"tags\": [\"vendor-advisory\", \"patch\"]}], \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"CWE\", \"cweId\": \"CWE-79\", \"description\": \"CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:microsoft:exchange_server_2016:*:cumulative_update_23:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"15.01.2507.069\", \"versionStartIncluding\": \"15.01.0.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_14:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"15.02.1544.041\", \"versionStartIncluding\": \"15.02.0.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_15:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"15.02.1748.046\", \"versionStartIncluding\": \"15.02.0.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:exchange_server_se:*:RTM:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"15.02.2562.043\", \"versionStartIncluding\": \"15.02.0.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2026-06-19T16:12:39.764Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-42897\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-19T16:12:39.764Z\", \"dateReserved\": \"2026-04-30T22:35:54.967Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2026-05-14T17:00:36.515Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.