---
id: CVE-2026-102523
title: 'MariaDB server: Authorization bypass via ALTER TABLE ... CONVERT ... PARTITION'
summary: >-
  MariaDB server is a community developed fork of MySQL server. From 10.11.1
  until 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2, ALTER TABLE ... CONVERT
  ... PARTITION does not apply filename encoding to user-specified partition
  names befo…
severity: high
cvss: 8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-73
vendor: MariaDB
product: server
affected:
  - 'server >= 10.11.1, < 10.11.19'
  - 'server >= 11.4.1, < 11.4.13'
  - 'server >= 11.8.1, < 11.8.9'
  - 'server >= 12.3.1, < 12.3.3'
  - 'server >= 13.0.1, < 13.0.2'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-05T20:41:38.446723Z'
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:41:48.469Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-102523'
references:
  - url: 'https://github.com/MariaDB/server/security/advisories/GHSA-h4vr-wpff-jfx4'
    label: 'https://github.com/MariaDB/server/security/advisories/GHSA-h4vr-wpff-jfx4'
  - url: >-
      https://github.com/MariaDB/server/commit/98437c30ae52ed709f266e5f8095d779261a5879
    label: >-
      https://github.com/MariaDB/server/commit/98437c30ae52ed709f266e5f8095d779261a5879
  - url: 'https://github.com/MariaDB/server/releases/tag/mariadb-10.11.19'
    label: 'https://github.com/MariaDB/server/releases/tag/mariadb-10.11.19'
  - url: 'https://github.com/MariaDB/server/releases/tag/mariadb-11.4.13'
    label: 'https://github.com/MariaDB/server/releases/tag/mariadb-11.4.13'
  - url: 'https://github.com/MariaDB/server/releases/tag/mariadb-11.8.9'
    label: 'https://github.com/MariaDB/server/releases/tag/mariadb-11.8.9'
  - url: 'https://github.com/MariaDB/server/releases/tag/mariadb-12.3.3'
    label: 'https://github.com/MariaDB/server/releases/tag/mariadb-12.3.3'
  - url: 'https://github.com/MariaDB/server/releases/tag/mariadb-13.0.2'
    label: 'https://github.com/MariaDB/server/releases/tag/mariadb-13.0.2'
  - url: 'https://jira.mariadb.org/browse/MDEV-40413'
    label: 'https://jira.mariadb.org/browse/MDEV-40413'
tags:
  - cve.org
ingestedAt: '2026-11-05T22:38:31.856Z'
---

## Overview

MariaDB server is a community developed fork of MySQL server. From 10.11.1 until 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2, ALTER TABLE ... CONVERT ... PARTITION does not apply filename encoding to user-specified partition names before using them in filesystem path construction. An authenticated database user can use a partition name requiring filename escaping to make the conversion operate on table files the user is not authorized to access, allowing unauthorized table reads or modifications. This issue is fixed in versions 10.11.19, 11.4.13, 11.8.9, 12.3.3, and 13.0.2.

## Affected

- `server >= 10.11.1, < 10.11.19`
- `server >= 11.4.1, < 11.4.13`
- `server >= 11.8.1, < 11.8.9`
- `server >= 12.3.1, < 12.3.3`
- `server >= 13.0.1, < 13.0.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.