The Facetag extension 0.0.3 for Piwigo allows XSS via the name parameter to ws.php in a facetag.changeTag action.
{
"cpe": "cpe:2.3:a:facetag_project:facetag:0.0.3:*:*:*:*:piwigo:*:*",
"extracted_events": [
{
"introduced": "0.0.3"
},
{
"last_affected": "0.0.3"
}
],
"source": "CPE_STRING"
}