CVE-2026-55026Disclosure(microsoft / 365_apps)

LOWCVSS 5.5 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to disclose information locally.

microsoft CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Patch / fix

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55026

Weakness type (CWE)

CWE-190

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

365_apps
microsoft_365
office_2016
office_2019

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Affected systems

Vendors

microsoft

Products

365_appsmicrosoft_365office_2016office_2019office_2021office_2024sharepoint_server

3 versions affected across 7 products

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://windowsforum.com/threads/cve-2026-55026-patch-office-and-sharepoint-data-disclosure.438684/?utm_source=x&utm_medium=social&utm_campaign=news_node84

Full discourse1 post

Windows Forum@windowsforum97d
Disclosure
🪟 Office and SharePoint could leak sensitive data with no privileges or clicks—just local access. Microsoft calls it “Important”; admins call it “yet another patch Tuesday side quest.” https://windowsforum.com/threads/cve-2026-55026-patch-office-and-sharepoint-data-disclosure.438684/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #MicrosoftOffice #SecurityUpdates #SharepointServer #Cve202655026 https://t.co/tdAX9xbEqW
Post summary
Microsoft has disclosed CVE‑2026‑55026, a local-access data leakage flaw in Office and SharePoint, noting it as important but without any exploit details or evidence of active attacks yet.
0000018
1.2K followersView on X

CPE platform detail16 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

16 of 16 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	microsoft	365_apps	-	-	x64
App	microsoft	365_apps	-	-	x86
App	microsoft	microsoft_365	-	macos	-
App	microsoft	office_2016	-	-	x64
App	microsoft	office_2016	-	-	x86
App	microsoft	office_2019	-	-	x64
App	microsoft	office_2019	-	-	x86
App	microsoft	office_2021	-	-	x64
App	microsoft	office_2021	-	-	x86
App	microsoft	office_2021	-	macos	-
App	microsoft	office_2024	-	-	x64
App	microsoft	office_2024	-	-	x86
App	microsoft	office_2024	-	macos	-
App	microsoft	sharepoint_server	-	-	-
App	microsoft	sharepoint_server	2016	-	-
App	microsoft	sharepoint_server	2019	-	-

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