Office is widely deployed; high-severity local code execution could disrupt many orgs.
CVE-2026-26110
MS Office type-confusion enables local code execution.
Is CVE-2026-26110 being exploited?
Not confirmed. CVE-2026-26110 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.49% probability of exploitation in the next 30 days.
How severe is CVE-2026-26110?
CVE-2026-26110 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-26110?
Yes. A fix has been recorded for CVE-2026-26110. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-26110 affect?
CVE-2026-26110 affects Microsoft Office. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-26110?
Apply updates when released; limit risky Office features/macros.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local arbitrary code execution via Office resource handling due to type confusion.
Patch when possible
- affected>= 16.0.1 and < https://aka.ms/OfficeSecurityReleases
- affected>= 16.0.0 and < 16.0.5543.1000
- affected>= 19.0.0 and < https://aka.ms/OfficeSecurityReleases
- affected>= 16.0.1 and < 16.0.19822.20000
- affected>= 16.0.1 and < https://aka.ms/OfficeSecurityReleases
- affected>= 16.0.0 and < https://aka.ms/OfficeSecurityReleases
- affected>= 16.0.1 and < 16.107.26030819
- affected>= 16.0.0 and < 16.107.26030819
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.