Quick answers
- Is CVE-2026-65658 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-65658 being exploited in the wild.
- How severe is CVE-2026-65658?
- High severity, with a CVSS score of 8.8, published 11 August 2026.
- Which products and versions are affected?
- Microsoft Office SharePoint <UNKNOWN>.
- Is there a fix for CVE-2026-65658?
- 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-2026-65658 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-65658?
- Check whether you run Microsoft Office SharePoint at an affected version. 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
This vulnerability involves insecure deserialization of untrusted data in Microsoft Office SharePoint. An authorized attacker with network access can craft malicious serialized objects that, when deserialized by the application, lead to arbitrary code execution. The attack requires valid credentials and network access to the SharePoint service, but no additional user interaction. Successful exploitation allows remote code execution in the context of the SharePoint application, potentially granting access to sensitive business data and system resources. A patch is expected to be available through Microsoft's regular security update channels.
Affected products
- Microsoft Office SharePoint <UNKNOWN>
Timeline
- 2026-08-11: disclosed