VulnSocial

CVE-2026-56156General(microsoft / 365_apps)

LOWCVSS 7.8 · HIGH

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

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

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0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-122

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

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

  • 1 mentions across 1 observed day

What's happening

  • Technical details provided in 1 signal
  • General: 1 classified 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
00111Mentions · 2026-07-15: 1Technical Details · 2026-07-15: 107-15
Signal classification1 categories
General
1100.0%
Referenced assets1 URL
Full discourse1 post
  • Windows Forum@windowsforum
    General

    🪟 Excel’s “remote” code execution is local in CVSS terms: the attacker can be remote, but the malicious file still has to reach your PC. Translation: dangerous attachment, not internet magic. https://windowsforum.com/threads/cve-2026-56156-excel-rce-is-local-cvss-7-8-not-network.438771/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #RemoteCodeExecution #Cvss #MicrosoftExcel #Cve202656156 https://t.co/e85QG6ya7s

    Post summary

    The tweet highlights that CVE‑2026‑56156 is a local‑based remote‑code‑execution vulnerability requiring a malicious file, but offers no PoC, exploit, patch, or evidence of active attacks.

    000008
    1.2K followersView on X
CPE platform detail9 entries

9 of 9 entries

PartVendorProductVersionTarget SWTarget HW
Appmicrosoft365_apps--x64
Appmicrosoft365_apps--x86
Appmicrosoftmicrosoft_365-macos-
Appmicrosoftoffice_2021--x64
Appmicrosoftoffice_2021--x86
Appmicrosoftoffice_2021-macos-
Appmicrosoftoffice_2024--x64
Appmicrosoftoffice_2024--x86
Appmicrosoftoffice_2024-macos-

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