Vulnerability · Published Oct 8, 2026 · Assigned by GitHub_M

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

Medium 5.4

In plain English

A medium-severity security flaw in indico from indico. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 90.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	indico	3.3.13	GHSA-c4wc-ggrj-jg9v
PyPI	indico	3.3.13	PYSEC-2026-4227

Affected products (as reported)

Vendor	Product	Versions
indico	indico	< 3.3.13

Weakness: CWE-692 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

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