# CVE-2026-123391

SharePoint authorization flaw lets authenticated users escalate privileges remotely.

- Page: https://www.vulneraibility.com/cve/CVE-2026-123391
- CVSS: 8.8
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.80% (percentile 56.9)
- CISA SSVC: exploitation none, automatable no, technical impact total (assessed 2026-11-11)
- Weakness: CWE-863
- Published: 2026-11-10

## Affected versions

- Microsoft Microsoft SharePoint Server Subscription Edition: affected >= 16.0.0 and < 16.0.20326.20136

A version outside these ranges is not a statement that it is unaffected.

## Impact

Authenticated attacker can elevate privileges on SharePoint remotely, potentially gaining admin rights, accessing sensitive data, and enabling lateral movement.

## Action

Immediate action required

## Recommendation

Install Microsoft's security update immediately; review admin accounts and logs.

## References

- [patch] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-123391

---
Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.