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GRANT PROXY with empty password incorrectly checks grantor's privileges

High
vuvova published GHSA-625w-4hgq-qwmr Sep 7, 2026

Package

No package listed

Affected versions

10.6.1-10.6.27, 10.11.1-10.11.18, 11.4.1-11.4.12, 11.8.1-11.8.8, 12.3.1-12.3.2, 13.0.1

Patched versions

10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, 13.0.2

Description

Impact

GRANT PROXY statement incorrectly checked grantor's privileges when the statement included IDENTIFIED clause with an empty password. This allowed an attacker to set passwords for other accounts.

Patches

Fixed in 10.6.28, 10.11.19, 11.4.13, 11.8.9, 12.3.3, 13.0.2.

Workarounds

An attacker won't be able to change another user's password, if user names are random and non-guessable.

References

https://jira.mariadb.org/browse/MDEV-40470

Credits

Kévin GERVOT

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVE ID

No known CVE

Weaknesses

Unverified Password Change

When setting a new password for a user, the product does not require knowledge of the original password, or using another form of authentication. Learn more on MITRE.

Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. Learn more on MITRE.

Credits