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Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-21258

CVE-2026-21258

MEDIUM5.5

Microsoft Excel Information Disclosure Vulnerability

Published Feb 10, 2026

Modified 5 days ago

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21258

https://www.cve.org/CVERecord?id=CVE-2026-21258

CVSS Analysis

CVSS v3.1

5.5

Exploitability

Attack Vector

LocalAV:L

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

RequiredUI:R

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

NoneI:N

Availability

NoneA:N

5.5/CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

Weakness Type (CWE)

Input Validation

Improper Input Validation

Memory Safety

Out-of-bounds Read

Ecosystems

Timeline

PublishedFeb 10, 2026

ModifiedFeb 27, 2026

CVE-2026-21258 | Mondoo Vulnerability Intelligence