CVE-2026-21514
KEVMicrosoft Office Word Reliance on Untrusted Inputs in a Security Decision Vulnerability
Description
Microsoft Office Word contains a reliance on untrusted inputs in a security decision vulnerability that could allow an authorized attacker to elevate privileges locally.
Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.
CVSS 3.1 vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HPublishedFeb 10, 2026
Last modifiedJun 17, 2026
Added to KEVFeb 10, 2026
Remediation dueMar 3, 2026
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21514Vendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21514US Government Resource
0 recent articles mention this CVE
69
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 237 days
- CVSS
- 7.8 HIGH
- EPSS (30-day exploit probability)
- 1.6% · top 25% of all CVEs
- Weakness
- CWE-807
Recommended actions
- 1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.