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UK Cyber Defence
VulnerabilityAnalyzed

CVE-2025-54898

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

HIGH 7.8EPSS 0.57%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.57%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

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

CVSS 3.1
7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
0.57% probability · 47th percentile
Public exploits
None in Exploit-DB
CISA KEV
Not listed
Weakness
CWE-125
Affected
microsoft/365 apps · microsoft/excel · microsoft/office · microsoft/office long term servicing channel · microsoft/office online server
Source
secure@microsoft.com
EPSS trend
0%3%5%26 October 2026: 0.57%26 October 202626 October 2026

EPSS 0.6% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.