Vulnerability-Lookup

MSRC_CVE-2026-42897

Vulnerability from csaf_microsoft - Published: 2026-05-14 07:00 - Updated: 2026-07-14 07:00

Summary

Microsoft Exchange Server Spoofing Vulnerability

Severity

Critical

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

Customer Action: Required. The vulnerability documented by this CVE requires customer action to resolve.

CVE-2026-42897

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

Affected products

Fixed 4 products

Product	Identifier	Version	Remediation
Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.069 Microsoft Exchange Server 2016 Cumulative Update 23		15.01.2507.069
Microsoft Exchange Server 2019 Cumulative Update 14 15.02.1544.041 Microsoft Exchange Server 2019 Cumulative Update 14		15.02.1544.041
Microsoft Exchange Server 2019 Cumulative Update 15 15.02.1748.046 Microsoft Exchange Server 2019 Cumulative Update 15		15.02.1748.046
Microsoft Exchange Server Subscription Edition RTM 15.02.2562.043 Microsoft Exchange Server Subscription Edition RTM		15.02.2562.043

Known affected 4 products

Product	Version	Remediation
Microsoft Exchange Server Subscription Edition RTM <15.02.2562.043 Microsoft Exchange Server Subscription Edition RTM	<15.02.2562.043	Vendor Fix fix
Microsoft Exchange Server 2019 Cumulative Update 15 <15.02.1748.046 Microsoft Exchange Server 2019 Cumulative Update 15	<15.02.1748.046	Vendor Fix fix
Microsoft Exchange Server 2019 Cumulative Update 14 <15.02.1544.041 Microsoft Exchange Server 2019 Cumulative Update 14	<15.02.1544.041	Vendor Fix fix
Microsoft Exchange Server 2016 Cumulative Update 23 <15.01.2507.069 Microsoft Exchange Server 2016 Cumulative Update 23	<15.01.2507.069	Vendor Fix fix

Threats

Impact Spoofing

Exploit Status Publicly Disclosed:No;Exploited:Yes;Latest Software Release:Exploitation Detected

References

7 references

URL	Category
https://msrc.microsoft.com/update-guide/vulnerabi…	self
https://msrc.microsoft.com/csaf/advisories/2026/m…	self
https://www.microsoft.com/en-us/msrc/exploitabili…	external
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/update-guide/vulnerabi…	self
https://msrc.microsoft.com/csaf/advisories/2026/m…	self

Acknowledgments

Anonymous

JSON

To clipboard

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        "title": "Additional Resources"
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        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
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        "name": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
      },
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        {
          "category": "faq",
          "text": "An attacker could exploit this issue by sending a specially crafted email to a user. If the user opens the email in Outlook Web Access and certain interaction conditions are met, arbitrary JavaScript can be executed in the browser context.\nThe Exchange Emergency Mitigation Service will provide mitigation automatically, and is on by default.  If it is not already enabled on your Exchange Server, you need to enable Exchange Emergency Mitigation Service.  You can find more information and instruction in the Exchange blog here.\nNo, because Content Security Policy (CSP) is not supported by Internet Explorer nor Microsoft Edge using Internet Explorer Mode. To stay protected, please make sure to not use Internet Explorer (Mode) to access OWA.\nMicrosoft recommends installing the July 2026 Security Updates for your version of Exchange Server as soon as possible to be protected from this vulnerability and related CVE-2026-55008 vulnerability. Mitigations that have been applied either using the Exchange Emergency Mitigation Service or the EOMT script can be removed after July 2026 update is installed. Please see the Exchange blog post for more information.",
          "title": "How could an attacker exploit this vulnerability?"
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            "confidentialityImpact": "HIGH",
            "environmentalScore": 0.0,
            "exploitCodeMaturity": "FUNCTIONAL",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
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            "temporalScore": 7.5,
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            "version": "3.1"
          },
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          "details": "Spoofing"
        },
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          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:Yes;Latest Software Release:Exploitation Detected"
        }
      ],
      "title": "Microsoft Exchange Server Spoofing Vulnerability"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-05-14 17:00 – Updated: 2026-08-10 15:14

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 · CISA-ADP (v2.0.3)

Decision recorded 2026-05-14 00:00 UTC

CWE

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

Assigner

microsoft CNA under the mitre root

CNA scorecard B 82/100 over 4926 records in the last 180 days details

References

2 references

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

4 products

Vendor	Product	Version
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 23	Affected: 15.01.0.0 , < 15.01.2507.069 (custom)
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 14	Affected: 15.02.0.0 , < 15.02.1544.041 (custom)
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 15	Affected: 15.02.0.0 , < 15.02.1748.046 (custom)
Microsoft	Microsoft Exchange Server Subscription Edition RTM	Affected: 15.02.0.0 , < 15.02.2562.043 (custom)

Date Public

2026-05-14 14:00

Show details on NVD website

JSON

To clipboard

{
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}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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