CVE-2026-21261

MEDIUM EPSS 44.0%
Published Feb 10, 20264mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Feb 10, 2026 4mo ago
Last Modified Jun 17, 2026 1w ago

Description

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

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality High
Integrity None
Availability None

Threat Intelligence

EPSS Exploit Probability
44.0% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 13

VendorProductVersionRange
microsoft365_apps*any
microsoft365_apps*any
microsoftexcel2016any
microsoftexcel2016any
microsoftoffice2019any
microsoftoffice2019any
microsoftoffice_long_term_servicing_channel2021any
microsoftoffice_long_term_servicing_channel2024any
microsoftoffice_long_term_servicing_channel2024any
microsoftoffice_long_term_servicing_channel2024any
microsoftoffice_long_term_servicing_channel2024any
microsoftoffice_long_term_servicing_channel2024any
microsoftoffice_online_server* <16.0.10417.20097

References 1

  • msrc.microsoft.com https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21261
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.