CVE-2026-21264

mediumpriority · track · 24EPSS 0.004 · 35 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.41% (35th) EPSS

CVSS 6.1 · medium

Is it mine?

12 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Account allows an unauthorized attacker to perform spoofing over a network.

cvss

Technical severity, 0–10. One row per scoring source.

9.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 5.6–9.3

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 2.7

v3.19.3criticalAV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:Nsecondary · FSTEC (BDU) RU

v3.19.3criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:Csecondary · ENISA EU

v3.19.3criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:Nsecondary · secure@microsoft.com USexploitability 2.8 · impact 5.8

v3.15.6mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.19.3criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USCWE-79USCWE-79US

affected products (12)

Products and version ranges known to be affected.

Microsoft 365 Copilot 365 Copilot's Business Chatall versionscert_bundDEcpe:/a:microsoft:365_copilot:-
Microsoft 365 Copilot Wordall versionscert_bundDEcpe:/a:microsoft:365_copilot:word
Microsoft Azure Accountall versionscert_bundDEcpe:/a:microsoft:azure:account
Microsoft Azure Data Explorerall versionscert_bundDEcpe:/a:microsoft:azure:data_explorer
Microsoft Azure Front Doorall versionscert_bundDEcpe:/a:microsoft:azure:front_door
Microsoft Azure Logic Appsall versionscert_bundDEcpe:/a:microsoft:azure:logic_apps
Microsoft Azure Resource Managerall versionscert_bundDEcpe:/a:microsoft:azure:resource_manager
Microsoft Entra IDall versionscert_bundDEcpe:/a:microsoft:entra:id
Microsoft Microsoft Accountall versionsenisa_euvdEU
Microsoft Corp Microsoft Accountall versionsfstec_bduRU
Microsoft Microsoft Accountall versionsfixedmsrc_csafUS
microsoft accountall versionsnvdUScpe:2.3:a:microsoft:account:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-0201Microsoft Azure, Copilot und Entra: Mehrere SchwachstellenDeutsch2026-01-22csaf · cert_bundDE
Ein entfernter Angreifer kann mehrere Schwachstellen in Microsoft Azure, Microsoft 365 Copilot und Microsoft Entra ausnutzen, um seine Privilegien zu erhöhen, Cross-Site-Scripting-Angriffe durchzuführen und vertrauliche Informationen offenzulegen.
msrc_CVE-2026-21264Microsoft Account Spoofing Vulnerability2026-01-22csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund msrc_csaf nvd NVD CVE.org MITRE

published 2026-01-22modified 2026-06-17

references (3)

External citations — patches, advisories, analysis.

scry

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