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Fencer Vulns
high 8.0

CVE-2026-102523 json

MariaDB server: Authorization bypass via ALTER TABLE ... CONVERT ... PARTITION

published 2026-09-07 2 mo ago modified 2026-11-06 2 d ago also EUVD-2026-117548 , GHSA-h4vr-wpff-jfx4

cvss
8.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

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 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.

Patch / fix

  • mariadb Debian 14 1:11.8.9+ds-1

debian advisories DEBIAN-CVE-2026-102523

  • mariadb openSUSE Tumbleweed 12.3.2-3.1

opensuse advisories openSUSE-SU-2026:12245-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-102523 updated cvss 8.8

mariadb: MariaDB: Unauthorized table access via unencoded partition names

  • Red Hat Hardened Images mariadb11.8 11.8.9-0.1.hum1, mariadb10.11 10.11.18-4.1.10.hum1
    under investigation

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
3 d ago

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected products

  • MariaDB server

Classification

Weakness
  • CWE-73 External Control of File Name or Path
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of MariaDB/server published their own advisory on GitHub. Reviewed sources take precedence over it.