Quick answers
- Is CVE-2026-123390 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123390 being exploited in the wild.
- How severe is CVE-2026-123390?
- High severity, with a CVSS score of 8.8, published 10 November 2026.
- Which products and versions are affected?
- Microsoft Office SharePoint.
- Is there a fix for CVE-2026-123390?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-123390 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-123390?
- Check whether you run Microsoft Office SharePoint. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A deserialization vulnerability in Microsoft Office SharePoint permits authenticated remote code execution via unsafe handling of untrusted serialized data. The attack requires valid authentication credentials and network access to SharePoint; no user interaction is required. An attacker can achieve arbitrary code execution with the privileges of the SharePoint application.
Affected products
- Microsoft Office SharePoint
Timeline
- 2026-11-10: disclosed