Quick answers
- Is CVE-2026-91503 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91503 being exploited in the wild.
- How severe is CVE-2026-91503?
- High severity, with a CVSS score of 8.1, published 20 October 2026.
- Which products and versions are affected?
- Oracle Database Server 19.3-19.32, 21.3-21.23, 23.4.0-23.26.3.
- Is there a fix for CVE-2026-91503?
- 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-2026-91503 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-91503?
- Check whether you run Oracle Database Server 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
A low-privileged attacker with Create Table privilege can exploit a flaw in Oracle Database Server's VPD component via Oracle Net (network access) to circumvent VPD security policies. The vulnerability allows unauthorized data access and modification across VPD-protected tables. No privilege escalation to administrative roles is required, only standard table creation rights.
Affected products
- Oracle Database Server 19.3-19.32, 21.3-21.23, 23.4.0-23.26.3
Timeline
- 2026-10-20: disclosed