Description
Piwigo is a full featured open source photo gallery application for the web. Prior to 16.4.0, admin/themes_standard_pages.php validates uploaded logo content by MIME type but reuses the attacker-controlled extension from std_pgs_logo when constructing the stored filename. An authenticated administrator can upload image content with a server-executable final extension, causing the file to be placed in the web-accessible logo directory and executed when requested if the web server handles that extension. This can permit arbitrary command execution, data disclosure, modification, persistence, and service disruption. This vulnerability is fixed in 16.4.0.
References5
- github.com/Piwigo/Piwigo/commit/1e7f7262cb30e6916779f93e66d5d65…
- github.com/Piwigo/Piwigo/commit/4a13ec9a8f4881ae1f23bdfd24d7b90…
- github.com/Piwigo/Piwigo/releases/tag/16.4.0
- github.com/Piwigo/Piwigo/security/advisories/GHSA-7w97-5g4p-xqvv
- github.com/Piwigo/Piwigo/security/advisories/GHSA-7w97-5g4p-xqvv
Metrics
- CVSS 3.1
-
9.1
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 70 · as of 9 November 2026
- CWE
- CWE-434
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.