CVE-2026-45659 KEV
8.8
HIGH · CVSS 3.1 · EPSS 2.7% (pctl 85)
Patch first
On CISA KEV — known exploited in the wild, due 2026-07-04.
Description
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Scoring
| CVSS | 8.8 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 2.7% — more likely to be exploited than 85% of all CVEs |
| Weakness | CWE-502 |
| On CISA KEV | yes — remediate by 2026-07-04 |
| Public exploit | none known |
| Published | 2026-05-22 |
| Last modified | 2026-07-23 |
CISA KEV
| Name | Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability |
|---|---|
| Added | 2026-07-01 |
| Due | 2026-07-04 |
| Vendor / product | Microsoft / SharePoint Server |
| Ransomware use | known |
Affected (1)
| Vendor | Product |
|---|---|
| microsoft | sharepoint server |
References
→ the Explorer · watch your stack · NVD