CVE-2026-107396

Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Prior to 3.3.13, users who can manage events or create content, including speakers who can upload material, can store crafted javascript URLs in fields that accept custom URLs. A user who follows one of these URLs can execute attacker-controlled script in the user's browser in the Indico origin. This issue is fixed in version 3.3.13.

Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Prior to 3.3.13, users who can manage events or create content, including speakers who can upload material, can store crafted javascript URLs in fields that accept custom URLs. A user who follows one of these URLs can execute attacker-controlled script in the user's browser in the Indico origin. This issue is fixed in version 3.3.13.

Impact

There is a Cross-Site-Scripting vulnerability in fields that allow entering custom URLs.

Patches

You should to update to Indico 3.3.13 as soon as possible. See the docs for instructions on how to update.

Workarounds

• Set CSP_ENABLED = True in indico.conf - this is recommended regardless of updating.
• Only let trustworthy users manage events or create content (including material uploads which speakers can typically do as well) on Indico.

For more information

If you have any questions or comments about this advisory:

• Open a thread in our forum
• Email us privately at [email protected]

Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Prior to 3.3.13, users who can manage events or create content, including speakers who can upload material, can store crafted javascript URLs in fields that accept custom URLs. A user who follows one of these URLs can execute attacker-controlled script in the user's browser in the Indico origin. This issue is fixed in version 3.3.13.

Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Prior to 3.3.13, users who can manage events or create content, including speakers who can upload material, can store crafted javascript URLs in fields that accept custom URLs. A user who follows one of these URLs can execute attacker-controlled script in the user's browser in the Indico origin. This issue is fixed in version 3.3.13.

Impact

There is a Cross-Site-Scripting vulnerability in fields that allow entering custom URLs.

Patches

You should to update to Indico 3.3.13 as soon as possible. See the docs for instructions on how to update.

Workarounds

• Set CSP_ENABLED = True in indico.conf - this is recommended regardless of updating.
• Only let trustworthy users manage events or create content (including material uploads which speakers can typically do as well) on Indico.

For more information

If you have any questions or comments about this advisory:

• Open a thread in our forum
• Email us privately at [email protected]

Impact

There is a Cross-Site-Scripting vulnerability in fields that allow entering custom URLs.

Patches

You should to update to Indico 3.3.13 as soon as possible. See the docs for instructions on how to update.

Workarounds

• Set CSP_ENABLED = True in indico.conf - this is recommended regardless of updating.
• Only let trustworthy users manage events or create content (including material uploads which speakers can typically do as well) on Indico.

For more information

If you have any questions or comments about this advisory:

• Open a thread in our forum
• Email us privately at [email protected]