CVE-2026-62914Network attack vector

Authenticated spoofing via web page XSS

Published Aug 11, 2026 · Updated Aug 25, 2026

Cross-site scripting in Microsoft Exchange Server before the August 11, 2026 security updates allows remote authenticated users to spoof Exchange content. Microsoft has not disclosed the affected Exchange page or parameter; public records identify only improper neutralization of untrusted data during web page generation. Per the published CVSS vector, exploitation requires low-privileged access and victim interaction, so exposure depends on valid credentials and delivery of attacker-influenced Exchange content.

CVSS severityUnavailable
Unscored
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Microsoft Exchange Server before the August 11, 2026 security updates allows remote authenticated users to spoof Exchange content. Microsoft has not disclosed the affected Exchange page or parameter; public records identify only improper neutralization of untrusted data during web page generation. Per the published CVSS vector, exploitation requires low-privileged access and victim interaction, so exposure depends on valid credentials and delivery of attacker-influenced Exchange content.

The record

CVE
CVE-2026-62914
Published
Aug 11, 2026
Updated
Aug 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.3MicrosoftCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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