WP Photo Album Plus is vulnerable to stored Cross-Site Scripting in all versions up to, and including, 9.2.03.001 through a decode-after-sanitize (double-encoding) flaw in the photo-comment pipeline. On write, wppadocomment() sanitizes the comment with wppafilterhtml() (wpkses) followed by wpstripalltags() (wppa-functions.php:2623-2624). Because wpstripalltags() only removes real tags, an attacker who submits a double HTML-entity-encoded payload (e.g. <img src=... onload=...>) passes the write filters as harmless entity text and is stored one decode-level down (<img ... onload=...>).

The WP Photo Album Plus WordPress plugin before 9.2.07.002 does not perform any capability or nonce check on one of its public REST endpoint actions, allowing unauthenticated users to delete the generated album export ZIP archives it stores.

The WP Photo Album Plus plugin for WordPress is vulnerable to Cross-Site Scripting in all versions up to, and including, 9.0.11.006 due to insufficient input sanitization and output escaping in the wppauserupload function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts in the photo album descriptions that execute in a victim's browser.

Cross-site scripting (XSS) vulnerability in wp-admin/admin.php in the WP Photo Album Plus plugin before 5.0.3 for WordPress allows remote attackers to inject arbitrary web script or HTML via the commentid parameter in a wppamanagecomments edit action.

Multiple cross-site scripting (XSS) vulnerabilities in wppa-ajax-front.php in the WP Photo Album Plus (aka WPPA) plugin before 6.1.3 for WordPress allow remote attackers to inject arbitrary web script or HTML via the (1) comemail or (2) comname parameter in a wppa do-comment action.