Affects Microsoft SharePoint, a widely used enterprise product; privilege escalation to admin could disrupt org operations and access to sensitive content.
CVE-2026-55052
Authenticated privilege escalation in Microsoft SharePoint allowing elevation to admin roles.
Is CVE-2026-55052 being exploited?
Not confirmed. CVE-2026-55052 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 0.94% probability of exploitation in the next 30 days.
How severe is CVE-2026-55052?
CVE-2026-55052 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-2026-55052?
Yes. A fix has been recorded for CVE-2026-55052. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55052 affect?
CVE-2026-55052 affects Microsoft Office SharePoint. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55052?
Restrict admin access, audit/reduce privileges, and apply Microsoft patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated network attacker can elevate SharePoint privileges to site/admin, enabling content/configuration control and lateral impact.
Patch when possible
- affected>= 16.0.0 and < 16.0.5561.1001
- affected>= 16.0.0 and < 16.0.10417.20175
- affected>= 16.0.0 and < 16.0.19725.20434
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.