Quick answers
- Is CVE-2026-77484 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-77484 being exploited in the wild.
- How severe is CVE-2026-77484?
- High severity, with a CVSS score of 8.8, published 8 September 2026.
- Which products and versions are affected?
- Microsoft SQL Server.
- Is there a fix for CVE-2026-77484?
- 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-2026-77484 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-77484?
- Check whether you run Microsoft SQL Server. 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
The vulnerability exists in SQL Server's deserialization routine, which fails to properly validate untrusted serialized data before processing it. An attacker with valid database credentials can craft a malicious serialized payload and send it over the network to trigger arbitrary code execution on the server. The attack requires an existing authenticated session, making it a post-compromise threat vector. Patches are available from Microsoft as detailed in the security advisory CVE-2026-77484.
Affected products
- Microsoft SQL Server
Timeline
- 2026-09-08: disclosed