Description
Piwigo is a full featured open source photo gallery application for the web. Prior to 16.4.0, check_upgrade_access_rights() in admin/include/functions_upgrade.php conditionally escapes the submitted username only when the removed get_magic_quotes_gpc function exists, so PHP 8 and later concatenate an unauthenticated username directly into the upgrade authentication SQL query. When database upgrades are pending, a crafted query result can satisfy the status and password checks, set PHPWG_IN_UPGRADE, and authorize upgrade execution without valid administrator credentials. This can cause unauthorized database integrity changes and service disruption. This vulnerability is fixed in 16.4.0.
References5
- github.com/Piwigo/Piwigo/commit/1ff9d04534feb5f8f3cc2d3613c0fe8…
- github.com/Piwigo/Piwigo/commit/2cfa7a3d194c8b95edde43038d8f5be…
- github.com/Piwigo/Piwigo/releases/tag/16.4.0
- github.com/Piwigo/Piwigo/security/advisories/GHSA-6wj3-7fhw-gfpm
- github.com/Piwigo/Piwigo/security/advisories/GHSA-6wj3-7fhw-gfpm
Metrics
- CVSS 3.1
-
8.1
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 70 · as of 9 November 2026
- CWE
- CWE-89
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.