What is the CVSS score of CVE-2026-42897?

CVE-2026-42897 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.2%.

Which versions of Microsoft Exchange Server are affected by CVE-2026-42897?

CVE-2026-42897 is a high-severity cross-site scripting vulnerability in Microsoft Exchange Server that allows unauthenticated remote attackers to steal credentials and spoof content, directly…. A patch is available.

Is there a public PoC exploit available for CVE-2026-42897?

Yes, a public proof-of-concept exploit is available for CVE-2026-42897. Prioritise patching immediately. EPSS: 0.2%.

Microsoft Exchange Server CVE-2026-42897

EUVD-2026-30343 HIGH

Cross-site Scripting (XSS) (CWE-79)

2026-05-14 microsoft

GHSA-3c39-338m-m4vp

XSS Microsoft

8.1

CVSS 3.1

Temporal: 7.5

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Added to CISA KEV

May 15, 2026 - 18:02 CISA

Analysis Generated

May 14, 2026 - 17:45 vuln.today

CVE Published

May 14, 2026 - 17:00 nvd

HIGH 8.1

DescriptionNVD

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.

AnalysisAI

Cross-site scripting (XSS) in Microsoft Exchange Server enables remote attackers to spoof content and steal credentials without authentication. Affects Exchange Server 2016 CU23, 2019 CU14/CU15, and Subscription Edition. …

RemediationAI

Within 24 hours: Identify all Microsoft Exchange Server instances (2016 CU23, 2019 CU14/CU15, and Subscription Edition) and document web-facing deployments. Within 7 days: Apply vendor-released patch from Microsoft MSRC security update guide to all affected servers; prioritize systems with external OWA/webmail access. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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CVE-2026-42897 vulnerability details – vuln.today

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Microsoft Exchange Server CVE-2026-42897

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

RemediationAI

Full analysis requires sign-in

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External POC / Exploit Code