CVE-2026-48579

highpriority · track · 30EPSS 0.010 · 63 %ileDEEUNLRUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.01% (63rd) EPSS

CVSS 7.5 · high

Is it mine?

14 products

Check your exposure

Who says so?

7 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose information over a network.

cvss

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

9.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.9–9.1

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.19.1criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Nsecondary · FSTEC (BDU) RU

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:Csecondary · ENISA EU

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Nsecondary · secure@microsoft.com USexploitability 3.9 · impact 5.2

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:Csecondary · NCSC-NL NL

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-285USCWE-285USCWE-285US

affected products (14)

Products and version ranges known to be affected.

Microsoft 365 Copilot 365 Copilot's Business Chatall versionscert_bundDEcpe:/a:microsoft:365_copilot:-
Microsoft Azure HorizonDBall versionscert_bundDEcpe:/a:microsoft:azure:horizondb
Microsoft Edge Copilot Chatall versionscert_bundDEcpe:/a:microsoft:edge:copilot_chat
Microsoft Exchange Onlineall versionscert_bundDEcpe:/a:microsoft:exchange:online
Microsoft Microsoft Exchange Onlineall versionsenisa_euvdEU
Microsoft Corp Microsoft Exchange Onlineall versionsfstec_bduRU
Microsoft Microsoft Exchange Onlineall versionsfixedmsrc_csafUS
Microsoft Exchange≤ vers:unknown/*ncsc_nlNL
Microsoft Microsoft Exchange Online≤ vers:unknown/*ncsc_nlNL
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23≤ vers:unknown/*ncsc_nlNL
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14≤ vers:unknown/*ncsc_nlNL
Microsoft Microsoft Exchange Server 2019 Cumulative Update 15≤ vers:unknown/*ncsc_nlNL
Microsoft Microsoft Exchange Server Subscription Edition RTM≤ vers:unknown/*ncsc_nlNL
microsoft exchange onlineall versionsnvdUScpe:2.3:a:microsoft:exchange_online:*:*:*:*:*:*:*:*

advisories (3)

Vendor and ecosystem advisories describing this.

NCSC-2026-0185Kwetsbaarheden verholpen in Microsoft ExchangeNL2026-06-09csaf · ncsc_nlNL
Microsoft heeft kwetsbaarheden verholpen in Exchange, zowel on-premise als online.
WID-SEC-W-2026-1792Microsoft Clouddienste: Mehrere Schwachstellen ermöglichen PrivilegieneskalationDeutsch2026-06-04csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in verschiedenen Microsoft Clouddiensten wie Azure HorizonDB, Exchange Online, 365 Copilot und dem Copilot Chat in Edge ausnutzen, um seine Privilegien zu erweitern, um beliebigen Code auszuführen und um Informationen offenzulegen.
msrc_CVE-2026-48579Microsoft Exchange Online Information Disclosure Vulnerability2026-06-04csaf · 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 ncsc_nl nvd NVD CVE.org MITRE

published 2026-06-04modified 2026-07-23

references (3)

External citations — patches, advisories, analysis.

scry

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