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2026-10-17 21:56 CEST · Intelligence refreshed (Europe/Stockholm)

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Latest synchronized CVE
CVSS 4.3 Published 2026-10-17 21:00 CEST
Vendor
Affected products
1 affected products/devices 1 software
General vulnerability query Recent High & critical CVEs

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CVSS 9.3/10 Critical severity

First published: 13 October 2026, 21:01 CEST · Last modified: 17 October 2026, 01:24 CEST

CVE lookup — correlated security and lifecycle intelligence

· 8 sources correlated

Critical severity — prioritize remediation

Microsoft Exchange Server Spoofing Vulnerability

SeverityCVSS 9.3Critical · Remote / network
ExploitationNone reportedEPSS 0.9% chance in 30 days
Affected products10 products10 softwareSupply chain4 downstream productsacross 1 vendor

Why this rating

  • It can be exploited remotely over the network.
  • Rated critical (CVSS 9.3); no exploitation is reported in current sources.
  • 4 products from other vendors bundle or depend on the affected component.

What to do

  1. Install Microsoft update KB5128896, KB5128895, KB5128897 and 2 more on affected Windows/Microsoft systems.
  2. Check your inventory against the 10 affected products — start with internet-facing systems.
  3. For products that bundle the component, follow each vendor's own advisory for its fixed release.
Vendor
Affected products
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+1 more

Affected products (examples)

Click to open the full list
Microsoft Exchange Server 2016 Cumulative Update 23Microsoft Exchange Server 2019 Cumulative Update 14Microsoft Exchange Server 2019 Cumulative Update 15Microsoft Exchange Server Subscription Edition RTMMicrosoft MicrosoftcustomAll 10 →

What the vulnerability is

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.

Detailed evidence Everything below supports the summary above. Open only what you need.

Direct connected intelligence KBs, campaigns & Oracle
Connected intelligence Direct relationships for
Matched intelligence coverage 8 sources
Microsoft KB EUVD Vulnrichment GHSA EPSS CWE CVE Affected Products
Supply-chain / downstream affected products 4 downstream

This view separates downstream/bundled/advisory-derived exposure from direct product assertions. It is correlation evidence, not proof that every listed deployment is exploitable; vendor/version/configuration validation still applies.

4downstream products
1vendors / ecosystems

Representative downstream relationships

Microsoft Exchange Server 2016 Cumulative Update 23 Software · Product-associated assertion · NVD/CVE catalog · supporting vendor/advisory evidence
Microsoft Exchange Server 2019 Cumulative Update 14 Software · Product-associated assertion · NVD/CVE catalog · supporting vendor/advisory evidence
Microsoft Exchange Server 2019 Cumulative Update 15 Software · Product-associated assertion · NVD/CVE catalog · supporting vendor/advisory evidence
Microsoft Exchange Server Subscription Edition RTM Software · Product-associated assertion · NVD/CVE catalog · supporting vendor/advisory evidence

Complete downstream evidence

Every downstream product relationship Scantide currently correlates for this CVE is listed below. Expand a category to inspect all products and their provenance.

Software · 4 relationships
Microsoft Exchange Server 2016 Cumulative Update 23 Microsoft
Vendor/advisory-supported Product-associated Assertion Source: NVD/CVE catalog high confidence
Microsoft Exchange Server 2019 Cumulative Update 14 Microsoft
Vendor/advisory-supported Product-associated Assertion Source: NVD/CVE catalog high confidence
Microsoft Exchange Server 2019 Cumulative Update 15 Microsoft
Vendor/advisory-supported Product-associated Assertion Source: NVD/CVE catalog high confidence
Microsoft Exchange Server Subscription Edition RTM Microsoft
Vendor/advisory-supported Product-associated Assertion Source: NVD/CVE catalog high confidence

Top downstream vendor ecosystems

Open complete affected inventory Open downstream vendor relationships
Cross-source correlations 8 matched lanes

Direct intelligence-source relationships

Direct intelligence-source lanes: every lane below has direct evidence for

in that Scantide intelligence collection. Lanes share the CVE as their join key; their presence together does not imply that one source explicitly referenced another source's record.

8 matched source lanes
Microsoft KB / MSRC · 9 ENISA EUVD CISA Vulnrichment GitHub Advisory EPSS MITRE CWE CVE / NVD catalog Affected products/devices · 10
Downstream affected vendors 1 vendors

Affected vendor/product relationships

These vendors are derived from affected product/device evidence tied to this CVE. This is intentionally separate from the direct intelligence-source lanes above: a vendor can have affected products without Scantide having a vendor-specific advisory or Microsoft KB record for the CVE.

 1 affected vendors represented

Affected software, operating systems, hardware and devices 10

Deduplicated across Scantide's structured CVE, NVD applicability, CSAF, vendor advisory, campaign and downstream product evidence. Taxonomy IDs and evidence-only identifiers are excluded from the asset count. Counts represent relationships Scantide can currently prove, not the theoretical maximum downstream ecosystem.

10Software / applications
NVD/CVE catalog 4CISA Vulnrichment 10Microsoft Kb 4
Expand all affected categories (10) How can this affect my environment?
Software (10 — click to show all)
Vendor: Microsoft
Software Affected range: All listed or unspecified versions Product-associated Assertion
Primary: NVD/CVE catalogCorroborated: CISA VulnrichmentCorroborated: Microsoft Kbhigh confidence
Vendor: Microsoft
Software Affected range: All listed or unspecified versions Product-associated Assertion
Primary: NVD/CVE catalogCorroborated: CISA VulnrichmentCorroborated: Microsoft Kbhigh confidence
Vendor: Microsoft
Software Affected range: All listed or unspecified versions Product-associated Assertion
Primary: NVD/CVE catalogCorroborated: CISA VulnrichmentCorroborated: Microsoft Kbhigh confidence
Vendor: Microsoft
Software Affected range: All listed or unspecified versions Product-associated Assertion
Primary: NVD/CVE catalogCorroborated: CISA VulnrichmentCorroborated: Microsoft Kbhigh confidence
Vendor: Microsoft
Software Affected range: version 15.01.0.0 — before 15.01.2507.077 Product-associated Assertion
Primary: CISA Vulnrichment — structured affected recordhigh confidence
Vendor: Microsoft
Software Affected range: All listed or unspecified versions Product-associated Assertion
Primary: CISA Vulnrichmentmedium-high confidence
Vendor: Not identified in correlated evidence
Software Affected range: All listed or unspecified versions Product-associated Assertion
Primary: CISA Vulnrichmentmedium-high confidence
Vendor: Microsoft
Software Affected range: version 15.02.0.0 — before 15.02.1544.050 Product-associated Assertion
Primary: CISA Vulnrichment — structured affected recordhigh confidence
Vendor: Microsoft
Software Affected range: version 15.02.0.0 — before 15.02.1748.055 Product-associated Assertion
Primary: CISA Vulnrichment — structured affected recordhigh confidence
Vendor: Microsoft
Software Affected range: version 15.02.0.0 — before 15.02.2562.056 Product-associated Assertion
Primary: CISA Vulnrichment — structured affected recordhigh confidence
What each source says 3
European vulnerability intelligence: ENISA EUVD cross-reference: EUVD-2026-100137.
Exploit probability: Estimated exploitation probability 0.86% — percentile 57.7%.
Vulnerability summary: Microsoft Exchange Server Spoofing Vulnerability
GitHub package advisories 1
Microsoft security update correlation 9

Microsoft CVE ↔ KB relationships from MSRC CVRF and Microsoft Support. Multiple rows can exist for one KB when product/build applicability or support-page evidence differs.

KB5128896
Microsoft Exchange Server 2019 Cumulative Update 15 Restart No MSRC CVRF
KB5128895
Microsoft Exchange Server Subscription Edition RTM Restart No MSRC CVRF
Open Microsoft update guidance
KB5128895
Microsoft Exchange Server Subscription Edition RTM MSRC CVRF
Open Microsoft update guidance
KB5128897
Microsoft Exchange Server 2019 Cumulative Update 14 Restart No MSRC CVRF
KB5128896
Microsoft Exchange Server 2019 Cumulative Update 15 MSRC CVRF
Open Microsoft update guidance
KB5128898
Microsoft Exchange Server 2016 Cumulative Update 23 MSRC CVRF
Open Microsoft update guidance
KB5128898
Microsoft Exchange Server 2016 Cumulative Update 23 Restart No MSRC CVRF
KB108875
Microsoft Exchange Server Subscription Edition RTM Restart No MSRC CVRF
Open Microsoft update guidance
KB5128897
Microsoft Exchange Server 2019 Cumulative Update 14 MSRC CVRF
Open Microsoft update guidance
Evidence coverage

Correlated from multiple vulnerability, exploitation, advisory, package and affected-product intelligence collections.

Technical query coverage · 16 collections queried · 1 CVEs correlated
2026-10-17 21:56 CESTIntelligence refreshed
1unique CVEs queried and enriched
1unique CVEs correlated to this result
1unique advisories correlated
16intelligence collections queried
Affected-product scope: The product/device count is the deduplicated set Scantide can prove from its currently ingested structured records and advisory text. It is not a claim that only those products were affected; component vulnerabilities such as Log4Shell can have a much larger downstream ecosystem. Advisory and vendor references are kept clickable so additional downstream exposure can be followed to the authoritative source.
Coverage note: Scantide correlates multiple public and locally indexed intelligence sources, but no dataset or matching process is complete. Results may omit software, dependencies, affected versions or advisories, and related records do not by themselves prove that a specific installation is vulnerable. Confirm important findings against vendor guidance and the installed product and version.