CVE-2026-101800: 
MySQL vulnerability analysis and mitigation

CVE-2026-101800 is a privilege escalation/authorization bypass vulnerability in Oracle MySQL Server and MySQL Cluster, affecting the Server: Security: Privileges component. It was disclosed on October 20, 2026, as part of Oracle's October 2026 Critical Patch Update (CPU). Affected versions include MySQL Server 8.4.0–8.4.12, 9.7.0–9.7.3, and 26.7.0–26.7.1, as well as MySQL Cluster 8.0.0–8.0.49, 8.4.0–8.4.12, 9.7.0–9.7.3, and 26.7.0–26.7.1. The vulnerability carries a CVSS v3.1 base score of 6.8 (Medium/High) (Oracle CPU Oct 2026). The vulnerability was reported to Oracle by Siddharth Shubham Pal (Oracle CPU Oct 2026).

The vulnerability is rooted in improper privilege enforcement within MySQL's security and privileges subsystem (CWE classification consistent with authorization bypass). A low-privileged, authenticated attacker with network access via multiple protocols can exploit this flaw to bypass privilege controls and gain unauthorized access to data or perform unauthorized data manipulation. The attack complexity is rated High, meaning exploitation requires specific conditions or additional steps beyond simply sending a crafted request, but no user interaction is required. No public technical write-ups or proof-of-concept code have been identified at this time (Oracle CPU Oct 2026).

Successful exploitation allows a low-privileged attacker to perform unauthorized creation, deletion, or modification of critical data, as well as gain unauthorized read access to all data accessible within the affected MySQL Server or MySQL Cluster instance. Both confidentiality and integrity are rated High impact, while availability is not affected. The scope of impact is limited to the vulnerable database instance itself, but sensitive data exfiltration and corruption of critical records are realistic outcomes (Oracle CPU Oct 2026).

There is no public proof-of-concept exploit code and no evidence of in-the-wild exploitation at this time. The EPSS score is 0.0, indicating a very low current probability of exploitation in the wild. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. The High attack complexity requirement reduces the immediate risk, as exploitation demands specific conditions to be met (Oracle CPU Oct 2026).

Oracle has released patches for this vulnerability as part of the October 2026 Critical Patch Update. Administrators should upgrade MySQL Server to versions beyond 8.4.12, 9.7.3, or 26.7.1, and MySQL Cluster to versions beyond 8.0.49, 8.4.12, 9.7.3, or 26.7.1 as applicable. As interim mitigations, Oracle recommends applying the principle of least privilege to all database accounts and restricting network access to MySQL services to only authorized hosts and users. Oracle strongly advises against relying on network-level blocking as a long-term solution, as it does not address the underlying vulnerability (Oracle CPU Oct 2026).

The vulnerability was included in Oracle's October 2026 CPU, which addressed 1,295 new security patches across Oracle's product families. AUSCERT published a security bulletin (ASB-2026.0272) referencing this and related MySQL vulnerabilities. No notable independent researcher commentary or significant social media discussion specific to CVE-2026-101800 has been identified beyond standard CPU coverage (Oracle CPU Oct 2026).