EUVD-2026-73306
GHSA-xh27-mf8q-r7c2
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Network delivery of malicious file, no auth needed, mandatory user open action (UI:R), disclosure-only impact with no integrity or availability effect.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Out-of-bounds read in Microsoft Excel enables an unauthenticated remote attacker to disclose sensitive memory contents when a victim opens a crafted Excel file. The vulnerability spans a broad range of Office product lines - including Office 2016, 2019, 2021 LTSC, 2024 LTSC, Microsoft 365 Apps for Enterprise, and Mac variants - making the exposure surface wide. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim actively open a malicious Excel file delivered by the attacker - the CVSS UI:R metric confirms this user interaction dependency. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N) reflects a network-reachable, low-complexity attack with no authentication requirement but mandatory user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released patch via Microsoft Update or the Microsoft Update Catalog, targeting the build thresholds confirmed in EUVD-2026-73306: Office 2016 to 16.0.5569.1000 or later, Office 2019 to 16.0.10417.20204 or later, Office LTSC 2021 to 16.0.14334.20896 or later, Office LTSC 2024 to 16.0.17932.20960 or later, and Microsoft 365 Apps for Enterprise to 16.0.20326.20136 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
Microsoft Outlook Remote Code Execution Vulnerability. Rated critical severity (CVSS 9.8), this vulnerability is remotel
Microsoft Excel Security Feature Bypass Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is no authenti
Microsoft Publisher Security Feature Bypass Vulnerability. Rated high severity (CVSS 7.3), this vulnerability is low att
Microsoft Office contains a security feature bypass (CVE-2026-21509, CVSS 7.8) where reliance on untrusted inputs in sec
Microsoft Office Word contains a security decision bypass (CVE-2026-21514, CVSS 7.8) through reliance on untrusted input
Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8), this vu
Microsoft Office Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is no authentic
Microsoft Excel Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is no authentica
Use-after-free vulnerability in Microsoft Office Word that allows local, unauthenticated attackers to execute arbitrary
Microsoft Excel Remote Code Execution Vulnerability. Rated high severity (CVSS 8.8), this vulnerability is remotely expl
Microsoft Office Elevation of Privilege Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is low attack
A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle obje
Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Information Disclosure
View allShare
External POC / Exploit Code
Leaving vuln.today