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TI-2026-72341 Aliases CVE-2026-70279GHSA-93hh-687q-gjhh

Cross-site scripting in Microsoft Exchange Server enables spoofing

Priority MEDIUM 45CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

Microsoft Exchange Server 2016 Cumulative Update 23, 2019 Cumulative Updates 14 and 15, and Subscription Edition RTM contain a cross-site scripting flaw (CWE-79) in web page generation. An unauthorized remote attacker can perform spoofing over the network, but a user must interact with the crafted content.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01286 70th percentileScored 2026-11-07
Fix Fixed Microsoft Exchange Server 2016 Cumulative Update 23 (Microsoft): 15.01.2507.077Microsoft Exchange Server 2019 Cumulative Update 14 (Microsoft): 15.02.1544.050+2 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 2315.01.0.0 to before 15.01.2507.07715.01.2507.077Patch availableCNA
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 1415.02.0.0 to before 15.02.1544.05015.02.1544.050Patch availableCNA
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 1515.02.0.0 to before 15.02.1748.05515.02.1748.055Patch availableCNA
MicrosoftMicrosoft Exchange Server Subscription Edition RTM15.02.0.0 to before 15.02.2562.05615.02.2562.056Patch availableCNA
  • Microsoft Exchange Server 2016 Cumulative Update 23 VendorMicrosoft Affected 15.01.0.0 to before 15.01.2507.077 Fixed in 15.01.2507.077 Patch available CNA
  • Microsoft Exchange Server 2019 Cumulative Update 14 VendorMicrosoft Affected 15.02.0.0 to before 15.02.1544.050 Fixed in 15.02.1544.050 Patch available CNA
  • Microsoft Exchange Server 2019 Cumulative Update 15 VendorMicrosoft Affected 15.02.0.0 to before 15.02.1748.055 Fixed in 15.02.1748.055 Patch available CNA
  • Microsoft Exchange Server Subscription Edition RTM VendorMicrosoft Affected 15.02.0.0 to before 15.02.2562.056 Fixed in 15.02.2562.056 Patch available CNA

Remediation

Install the fixed builds: Exchange Server 2016 Cumulative Update 23 version 15.01.2507.077, 2019 Cumulative Update 14 version 15.02.1544.050, 2019 Cumulative Update 15 version 15.02.1748.055, and Subscription Edition RTM version 15.02.2562.056.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Microsoft Exchange Server 2016 Cumulative Update 23 (Microsoft) Fixed in 15.01.2507.077
  • Fix · CNA Microsoft Exchange Server 2019 Cumulative Update 14 (Microsoft) Fixed in 15.02.1544.050
  • Fix · CNA Microsoft Exchange Server 2019 Cumulative Update 15 (Microsoft) Fixed in 15.02.1748.055
  • Fix · CNA Microsoft Exchange Server Subscription Edition RTM (Microsoft) Fixed in 15.02.2562.056

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-70279
  2. 2026-10-13 Alias added: GHSA-93hh-687q-gjhh
  3. 2026-10-13 CISA SSVC decision points changed
  4. 2026-10-14 Priority changed: MEDIUM → LOW
  5. 2026-10-14 Priority changed: LOW → MEDIUM

References

Patch 1

  • TI-2026-42212 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-37256 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-16982 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-36863 Windows Server Update Service (WSUS) Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-33671 Microsoft SharePoint Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
See all 18045 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences