Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally.
References
| Link | Resource |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21509 | Vendor Advisory |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21509 | US Government Resource |
Configurations
Configuration 1 (hide)
|
History
27 Jan 2026, 16:19
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x64:* cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:* cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:* cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x86:* cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:* cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:* cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:* cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:* cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:* cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:* |
|
| First Time |
Microsoft office
Microsoft 365 Apps Microsoft Microsoft office Long Term Servicing Channel |
|
| References | () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21509 - Vendor Advisory | |
| References | () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21509 - US Government Resource |
26 Jan 2026, 21:15
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
26 Jan 2026, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-01-26 18:16
Updated : 2026-01-27 16:19
NVD link : CVE-2026-21509
Mitre link : CVE-2026-21509
CVE.ORG link : CVE-2026-21509
JSON object : View
Products Affected
microsoft
- office_long_term_servicing_channel
- office
- 365_apps
CWE
CWE-807
Reliance on Untrusted Inputs in a Security Decision