CVE-2026-70279 | BDVDB-2026-387014 Detail

MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 23

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: network.

Weaknesses#

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References#

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70279

Exploit#

No public exploit known

History#

Version 12026-10-13Record published in the CVE List.
Version 22026-10-31Most recent update recorded in the CVE List.

Published

Published: 2026-10-13
Last modified: 2026-10-31

Vendor information

Vendor: Microsoft
Product: Microsoft Exchange Server 2016 Cumulative Update 23

All Microsoft vulnerabilities

Score

9.3 Critical

EPSS

1.2%, Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 70.3.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Cross-Site Scripting

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 15.01.0.0 and < 15.01.2507.077
Fixed
15.01.2507.077

Scoring System

CVSS v4.0

Not available

CVSS v3.1

9.3 Critical

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	Required
Scope	Changed
Confidentiality	High
Integrity	High
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).