CVE-2026-21514 · netVigilance record NV26-0026
Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision
past due
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA deadline 2026-03-03 · passed 6 months ago · applies to US federal civilian agencies; used elsewhere as a reference SLA
What happened
Microsoft Office Word contains a reliance on untrusted inputs in a security decision vulnerability that could allow an authorized attacker to elevate privileges locally.
Who is affected
Microsoft Office. Affected version ranges are listed in the vendor advisory and the NVD entry linked under Sources.
Weakness class: CWE-807.
Timeline
- Added to CISA KEVExploitation in the wild confirmed by CISA
- CISA remediation deadlinepassed 6 months ago
Sources
- NVD entry for CVE-2026-21514 nvd.nist.gov/vuln/detail/CVE-2026-21514
- CISA Known Exploited Vulnerabilities catalog www.cisa.gov/known-exploited-vulnerabilities-catalog
- msrc.microsoft.com msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21514
- nvd.nist.gov nvd.nist.gov/vuln/detail/CVE-2026-21514