CVE-2026-63512: Microsoft SharePoint Server Tampering Vulnerability
Incorrect authorization in Microsoft Office SharePoint allows an authorized attacker to perform tampering over a network.
CSIRTS triage
- What
- Incorrect authorization checks in SharePoint Server allow tampering by authorized attackers.
- Who is affected
- Authorized users on SharePoint Server deployments.
- Urgency
- Medium severity (6.5 CVSS); requires existing authorization but enables unauthorized modifications.
- Action
- Apply SharePoint Server security updates for CVE-2026-63512.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63512
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-635120.55% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 43% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-63512 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
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