Event Gallery vulnerabilities

The Joomla extension Event Gallery versions < 6.6.0 contains a server-side request forgery vulnerability in the Google Photos picker on the back-end upload page. The picker fetches thumbnails of picked images through the server, using the OAuth access token of the Google Photos account. The task takes the address from the request without checking it and asks for no form token. A prepared page on another web site could make the server send the access token to any address, or fetch addresses inside the server's network, in the name of a logged in administrator.

In the Joomla Event Gallery extension versions below 6.6.0, there is XSS and open redirect on the share mini page. The article address from the shared link is printed without checking or escaping, and with the link type "Image Page with Redirect" it follows the address immediately.

In the Joomla Event Gallery extension versions below 6.6.0, eight tasks called by back-end list buttons do not check the form token. A prepared page on another site could trigger them in the name of a logged-in administrator and change settings and flags.

Joomla Extension - svenbluege.de - Reflected XSS and open redirect in Event Gallery extension < 6.5.0 - The “return” parameter is base64-decoded and written to the “Back” link without being validated.

Joomla Extension - svenbluege.de - Authenticated arbitrary path deletion in 'clear cache' task in Event Gallery extension < 6.5.0 - Using the 'images' parameter of the 'cache.process' task, you can recursively delete any directories that the web server is authorized to write to.

Joomla Extension - svenbluege.de - CSRF in backend cleanup actions in Event Gallery extension < 6.5.0 - Only orphaned file entries and shopping carts that are older than 30 days will be deleted.

Joomla Extension - svenbluege.de - CSRF in various cart actions in Event Gallery extension < 6.5.0

Joomla Extension - svenbluege.de - CSRF in image upload in Event Gallery extension < 6.5.0 - Due to lack of an CSRF token check, a third-party site can upload files to an event and overwrite existing files with the same name.