Affects widely used SharePoint; network RCE with valid credentials could disrupt enterprises.
CVE-2026-26106
RCE via input validation flaw in SharePoint over network
Is CVE-2026-26106 being exploited?
Not confirmed. CVE-2026-26106 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 1.4% probability of exploitation in the next 30 days.
How severe is CVE-2026-26106?
CVE-2026-26106 is rated High with a CVSS score of 8.8. 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-2026-26106?
Yes. A fix has been recorded for CVE-2026-26106. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-26106 affect?
CVE-2026-26106 affects Microsoft Office SharePoint. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-26106?
Apply patch when released; restrict external SharePoint access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution on SharePoint via crafted input over network with valid credentials.
Patch when possible
- affected>= 16.0.0 and < 16.0.5543.1000
- affected>= 16.0.0 and < 16.0.10417.20102
- affected>= 16.0.0 and < 16.0.19725.20076
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.