CVE-2026-107396: Indico: Cross-Site-Scripting in link fields

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-08 · updated 2026-10-09
Weakness: CWE-692

Description

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.

Affected products

indico: before 3.3.13

References

https://github.com/indico/indico/commit/d4c8c7127176efa4cb53c64119ca8ee2b551be18
https://github.com/indico/indico/pull/7619
https://github.com/indico/indico/releases/tag/v3.3.13
https://github.com/indico/indico/security/advisories/GHSA-c4wc-ggrj-jg9v

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