Vulnerability Database

383,304

Total vulnerabilities in the database

CVE-2026-42897 — microsoft / exchange_server_subscription_edition

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

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.

  • Published: May 14, 2026
  • Updated: Sep 13, 2026
  • CVE: CVE-2026-42897
  • Severity: High
  • Exploit:
  • CISA KEV:

CVSS v3:

  • Severity: High
  • Score: 8.1
  • AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Software Affected versions
microsoft / exchange_server_subscription_edition < 15.02.2562.043
microsoft / exchange_server = 2016
microsoft / exchange_server = 2016-cumulative_update_1
microsoft / exchange_server = 2016-cumulative_update_10
microsoft / exchange_server = 2016-cumulative_update_11
microsoft / exchange_server = 2016-cumulative_update_12
microsoft / exchange_server = 2016-cumulative_update_13
microsoft / exchange_server = 2016-cumulative_update_14
microsoft / exchange_server = 2016-cumulative_update_15
microsoft / exchange_server = 2016-cumulative_update_16
microsoft / exchange_server = 2016-cumulative_update_17
microsoft / exchange_server = 2016-cumulative_update_18
microsoft / exchange_server = 2016-cumulative_update_19
microsoft / exchange_server = 2016-cumulative_update_2
microsoft / exchange_server = 2016-cumulative_update_20
microsoft / exchange_server = 2016-cumulative_update_21
microsoft / exchange_server = 2016-cumulative_update_22
microsoft / exchange_server = 2016-cumulative_update_23
microsoft / exchange_server = 2016-cumulative_update_3
microsoft / exchange_server = 2016-cumulative_update_4
microsoft / exchange_server = 2016-cumulative_update_5
microsoft / exchange_server = 2016-cumulative_update_6
microsoft / exchange_server = 2016-cumulative_update_7
microsoft / exchange_server = 2016-cumulative_update_8
microsoft / exchange_server = 2016-cumulative_update_9
microsoft / exchange_server = 2019
microsoft / exchange_server = 2019-cumulative_update_1
microsoft / exchange_server = 2019-cumulative_update_10
microsoft / exchange_server = 2019-cumulative_update_11
microsoft / exchange_server = 2019-cumulative_update_12
microsoft / exchange_server = 2019-cumulative_update_13
microsoft / exchange_server = 2019-cumulative_update_14
microsoft / exchange_server = 2019-cumulative_update_2
microsoft / exchange_server = 2019-cumulative_update_3
microsoft / exchange_server = 2019-cumulative_update_4
microsoft / exchange_server = 2019-cumulative_update_5
microsoft / exchange_server = 2019-cumulative_update_6
microsoft / exchange_server = 2019-cumulative_update_7
microsoft / exchange_server = 2019-cumulative_update_8
microsoft / exchange_server = 2019-cumulative_update_9
microsoft / exchange_server_2016 >= 15.01.0.0, < 15.01.2507.069
microsoft / exchange_server_2019 >= 15.02.0.0, < 15.02.1544.041
microsoft / exchange_server_2019 >= 15.02.0.0, < 15.02.1748.046
microsoft / exchange_server_se >= 15.02.0.0, < 15.02.2562.043

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.