Widely deployed Microsoft Office SharePoint; privilege escalation could disrupt enterprise operations if exploited.
CVE-2026-45484
SharePoint deserialization causes network privilege escalation.
Is CVE-2026-45484 being exploited?
Not confirmed. CVE-2026-45484 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 35% probability of exploitation in the next 30 days.
How severe is CVE-2026-45484?
CVE-2026-45484 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-2026-45484?
Yes. A fix has been recorded for CVE-2026-45484. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-45484 affect?
CVE-2026-45484 affects Microsoft Office SharePoint Server. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-45484?
Apply patch/update SharePoint to latest security release
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authorized attacker can escalate privileges via deserialization in SharePoint over the network.
Patch when possible
- affected>= 16.0.0 and < 16.0.5556.1005
- affected>= 16.0.0 and < 16.0.10417.20153
- affected>= 16.0.0 and < 16.0.19725.20384
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.