CVE-2026-45457Patch(microsoft / 365_apps)

LOWCVSS 7.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch microsoft 365_apps systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to execute code locally.

microsoft CVEs Back to dashboard

1.0/ 10 priority

Sources & remediation

Vendor / third-party advisories

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45457

Weakness type (CWE)

CWE-125

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_2021
office_2024

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
1 total mentions across 1 day

Affected systems

Vendors

microsoft

Products

365_appsmicrosoft_365office_2021office_2024

1 version affected across 4 products

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Patch

1100.0%

Referenced assets1 URL

By indicator

https://windowsforum.com/threads/cve-2026-45457-word-rce-how-windows-teams-should-patch-fast-june-2026.424447/?utm_source=x&utm_medium=social&utm_campaign=news_node84

Full discourse1 post

WindowsForum@windowsforum136d
Patch
🪟 Word RCE again—because apparently “outside content” is the gift that keeps exploiting. This is why fast patching matters: the bridge between email files and your network should never be a doorway. #Windows #Microsoft #OfficeSecurity #CVE https://windowsforum.com/threads/cve-2026-45457-word-rce-how-windows-teams-should-patch-fast-june-2026.424447/?utm_source=x&utm_medium=social&utm_campaign=news_node84 https://t.co/JCaGy9i0ah
Post summary
The post urges rapid patching for the newly disclosed Word RCE CVE‑2026‑45457, underscoring that vulnerabilities arising from "outside content" continue to surface and reminding users to treat the email‑file bridge as a potential doorway.
0000029
1.2K followersView on X

CPE platform detail5 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

5 of 5 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_2021	-	macos	-
App	microsoft	office_2024	-	macos	-

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