Widely deployed Microsoft SharePoint; auth bypass enabling privilege escalation can impact many enterprises and requires broad notification.
CVE-2026-88164
Authorization bypass in Microsoft SharePoint allows privilege escalation over the network.
Is CVE-2026-88164 being exploited?
Not confirmed. CVE-2026-88164 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 0.74% probability of exploitation in the next 30 days.
How severe is CVE-2026-88164?
CVE-2026-88164 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-2026-88164?
Yes. A fix has been recorded for CVE-2026-88164. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-88164 affect?
CVE-2026-88164 affects Microsoft Office SharePoint. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-88164?
Install Microsoft SharePoint security update immediately; restrict admin accounts and monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can bypass authorization to escalate privileges, potentially gain admin-level access and modify or share sensitive data.
Immediate action required
- affected>= 16.0.0 and < 16.0.20326.20190
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.